Hitachi Energy RTU500 Product

CCISA Advisories · 6 hours ago

View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. These vulnerabilities if exploited can have impact on confidentiality, integrity and availability of the product. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy RTU500 Product are affected: RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=13.5.1|<=13.5.4, vers:RTU500_series_CMU_Firmware/>=13.6.1|<=13.6.3, vers:RTU500_series_CMU_Firmware/>=13.7.1|<=13.7.8, vers:RTU500_series_CMU_Firmware/>=13.8.1|<=13.8.2, vers:RTU500_series_CMU_Firmware/>=12.7.1|<=12.7.7 (CVE-2026-17539, CVE-2026-28388, CVE-2026-6732, CVE-2026-6653, CVE-2026-6276, CVE-2026-9079, CVE-2026-11856, CVE-2026-8927, CVE-2026-8932, CVE-2026-17539, CVE-2026-28388, CVE-2026-6732, CVE-2026-6653, CVE-2026-6276, CVE-2026-9079, CVE-2026-11856, CVE-2026-8927, CVE-2026-8932, CVE-2026-17539, CVE-2026-28388, CVE-2026-6732, CVE-2026-6653, CVE-2026-6276, CVE-2026-9079, CVE-2026-11856, CVE-2026-8927, CVE-2026-8932, CVE-2026-17539, CVE-2026-28388, CVE-2026-6732, CVE-2026-6653, CVE-2026-6276, CVE-2026-9079, CVE-2026-11856, CVE-2026-8927, CVE-2026-8932, CVE-2026-17539, CVE-2026-28388, CVE-2026-6653) CVSS Vendor Equipment v3 8.8 Hitachi Energy RTU500 series CMU Firmware 7 Vulnerabilities NULL Pointer Dereference, Access of Resource Using Incompatible Type ('Type Confusion'), Use After Free, Cleartext Transmission of Sensitive Information, Insufficiently Protected Credentials, Authentication Bypass by Capture-replay, Authentication Bypass by Primary Weakness Background Critical Infrastructure Sectors: Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Switzerland Vulnerabilities Expand All + CVE-2026-17539 RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication. Read More 5 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 Additional Metrics Relevant CWE: CWE-476 NULL Pointer Dereference CVSS Version Base Score Base Severity Vector String 3.1 5.9 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H View CVE Details CVE-2026-28388 A vulnerability exists in OpenSSL library component of RTU500 that is used for secure HTTPS access, authenticating and establishing encrypted communications with other devices. When processing a malformed delta CRL with a Delta CRL Indicator but no required CRL Number extension, OpenSSL may dereference a NULL pointer, causing a Denial of Service during X.509 certificate verification. Exploitation requires delta CRL processing to be enabled, a relevant freshest CRL condition to be present, and an attacker-supplied malformed CRL. The issue is limited to Denial of Service and cannot lead to code execution or memory disclosure. Read More 10 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 Additional Metrics Relevant CWE: CWE-476 NULL Pointer Dereference CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H View CVE Details CVE-2026-6732 The XML-based services used in RTU500 has a vulnerability while processing a specially crafted XSD-validated XML document may trigger a type confusion error in libxml2. An attacker could exploit this condition to cause a denial of service. Read More 14 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H View CVE Details CVE-2026-6653 The XML-based services used in RTU500 has a vulnerability, where a use-after-free vulnerability in the xmlParseInternalSubset function of libxml2 may be triggered by processing specially crafted XML input. Improper handling of entity resolution can allow a remote attacker to cause a denial of service. Read More 19 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 12.7.8 OR Vendor fixUpgrade to CMU Firmware version 13.9.1 Additional Metrics Relevant CWE: CWE-416 Use After Free CVSS Version Base Score Base Severity Vector String 3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H View CVE Details CVE-2026-6276 A vulnerability exists in the web-based management and services functions of RTU500 using libcurl library, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom `Host:` header set, the second request would use leaked stale information and pass on cookies meant for the first host in the second request. Read More 23 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-319 Cleartext Transmission of Sensitive Information CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H View CVE Details CVE-2026-9079 A vulnerability exists in the web-based management and services functions of RTU500 using libcurl library. libcurl may fail to clear proxy authentication credentials when instructed to do so. As a result, stale credentials can be reused by subsequent transfers that should not access them, potentially exposing sensitive proxy authentication information. Read More 27 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-522 Insufficiently Protected Credentials CVSS Version Base Score Base Severity Vector String 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N View CVE Details CVE-2026-11856 A vulnerability exists in the web-based management and services functions of RTU500 using libcurl library. When the same libcurl handle is reused after a transfer to one HTTP origin using Digest authentication, libcurl may incorrectly send the Authorization header intended for the first origin to a second origin. This can disclose authentication information to an unintended host. Read More 31 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-294 Authentication Bypass by Capture-replay CVSS Version Base Score Base Severity Vector String 3.1 8.1 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H View CVE Details CVE-2026-8927 A vulnerability exists in the web-based management and services functions of RTU500 using libcurl library. When reusing a libcurl handle for sequential transfers with environment-variable proxy configuration, libcurl may fail to clear proxy authentication state between requests. This can leak the Proxy-Authorization header intended for one proxy to another proxy. Read More 35 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-294 Authentication Bypass by Capture-replay CVSS Version Base Score Base Severity Vector String 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N View CVE Details CVE-2026-8932 A vulnerability exists in the web-based management and services functions of RTU500 using libcurl library. libcurl may reuse an existing connection even after mTLS-related configuration options, especially client certificate or private key settings, have changed. This can bypass the intended authentication configuration and allow use of a connection that should no longer be reused. Read More 39 Affected Products RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 12.7.1 – 12.7.7 Product Status: known_affected Remediations RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* RTU500 series CMU Firmware version 13.5.1 – 13.5.4 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.6.1 – 13.6.3 Product Status: known_affected Remediations Vendor fixUpdate to CMU Firmware version 13.9.1 MitigationFollow general mitigation factors/workarounds RTU500 series CMU Firmware version 13.7.1 – 13.7.8 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.7.9 (when available) RTU500 series CMU Firmware version 13.8.1 – 13.8.2 Product Status: known_affected Remediations MitigationFollow general mitigation factors/workarounds Vendor fixUpdate to CMU Firmware version 13.9.1 or 13.8.3* Additional Metrics Relevant CWE: CWE-305 Authentication Bypass by Primary Weakness CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N View CVE Details Acknowledgments Hitachi Energy Internal Team reported these vulnerabilities to CISA. Notice The information in this document is subject to change without notice and should not be construed as a commitment by Hitachi Energy. Hitachi Energy provides no warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, for the information contained in this document, and assumes no responsibility for any errors that may appear in this document. In no event shall Hitachi Energy or any of its suppliers be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, or from the use of any hardware or software described in this document, even if Hitachi Energy or its suppliers have been advised of the possibility of such damages. This document and parts hereof must not be reproduced or copied without written permission from Hitachi Energy and the contents hereof must not be imparted to a third party nor used for any unauthorized purpose. All rights to registrations and trademarks reside with their respective owners. Support For additional information and support please contact your product provider or Hitachi Energy service organization. For contact information, see https://www.hitachienergy.com/contact-us/ for Hitachi Energy contact-centers. General Mitigation Factors Recommended security practices and firewall configurations can help protect a process control network from attacks that originate from outside the network. Such practices include that process control systems are physically protected from direct access by unauthorized personnel, have no direct connections to the Internet, and are separated from other networks by means of a firewall system that has a minimal number of ports exposed, and others that have to be evaluated case by case. Process control systems should not be used for Internet surfing, instant messaging, or receiving e-mails. Portable computers and removable storage media should be carefully scanned for viruses before they are connected to a control system. Proper password policies and processes should be followed. Additional information on Industrial Control Systems Cybersecurity Best Practices can be found in the Hitachi Energy “Industrial Control Systems Cybersecurity Best Practices” Cybersecurity Notification. [1] SSVC SSVCv2/E:N/A:N/2026-09-28T14:29:30Z/ Recommended Practices CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. Advisory Conversion Disclaimer This ICSA is a verbatim republication of Hitachi Energy PSIRT 8DBD000259 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA does not endorse any commercial product or service. Please contact Hitachi Energy PSIRT directly for any questions regarding this advisory. Revision History Initial Release Date: 2026-09-01 Date Revision Summary 2026-09-01 1 Initial public release 2026-09-29 2 Updated fixed version 12.7.8 2026-10-20 3 Initial CISA Republication of Hitachi Energy PSIRT 8DBD000259 advisory Legal Notice and Terms of Use