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Industrial control advisorySeverity 8.8 high

Hitachi Energy RTU500 Product

ICSA-26-293-05 · CISA · September 1, 2026

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.

From CISA, quoted as published. Check the source before acting.

What to do

Update to CMU Firmware version 13.9.1 Follow general mitigation factors/workarounds Update to CMU Firmware version 13.9.1 or 13.7.9 (when available) Update to CMU Firmware version 13.9.1 or 13.8.3* Update to CMU Firmware version 12.7.8 OR Upgrade to CMU Firmware version 13.9.1

Vendor fix or mitigation, quoted from the advisory.

Each CVE in this advisory

CVESeverityKnown exploitedExploit likelihoodWeakness
CVE-2026-175395.9 mediumNo0.4%NULL Pointer Dereference (CWE-476)
CVE-2026-283887.5 highNo0.9%NULL Pointer Dereference (CWE-476)
CVE-2026-67327.5 highNo0.6%Access of Resource Using Incompatible Type (CWE-843)
CVE-2026-66538.8 highNo0.4%Use After Free (CWE-416)
CVE-2026-62767.5 highNo0.3%Cleartext Transmission of Sensitive Information (CWE-319)
CVE-2026-90795.3 mediumNo1.1%Insufficiently Protected Credentials (CWE-522)
CVE-2026-118568.1 highNo0.7%Authentication Bypass by Capture-replay (CWE-294)
CVE-2026-89275.3 mediumNo0.5%Authentication Bypass by Capture-replay (CWE-294)
CVE-2026-89327.5 highNo0.4%Authentication Bypass by Primary Weakness (CWE-305)

Severity from the advisory (CVSS), known exploitation from CISA's catalog, exploit likelihood from EPSS (next 30 days).

Affected products

VendorProductAffected versionsFixed
Hitachi EnergyRTU500 series CMU Firmwarevers: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—

Why it's on these mode pages

  • Maritime: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)
  • Pipeline: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)
  • Freight rail: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)
  • Passenger rail and transit: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)
  • Highway and motor carrier: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)
  • Postal and parcel: Vendor table: Hitachi Energy (industrial control makers used in every mode, all modes) (matched by rule)

Change history

  1. September 1, 2026: Initial public release
  2. September 29, 2026: Updated fixed version 12.7.8
  3. October 20, 2026: Initial CISA Republication of Hitachi Energy PSIRT 8DBD000259 advisory
  4. November 9, 2026: First collected by Watch

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