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Industrial control advisorySeverity 7.5 high

Hitachi Energy RTU500 Product (Update A)

ICSA-26-062-03 · CISA · February 24, 2026

Summary

Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. Successful exploitation of these vulnerabilities can result in the exposure of low-value user management information and device outage. 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 12.7.8 Follow general mitigation factors/workarounds Update to CMU Firmware version 13.7.8 or latest Update to CMU Firmware version 13.8.2

Vendor fix or mitigation, quoted from the advisory.

Each CVE in this advisory

CVESeverityKnown exploitedExploit likelihoodWeakness
CVE-2026-17724.3 mediumNo0.3%Improper Handling of Insufficient Permissions or Privileges (CWE-280)
CVE-2026-17737.5 highNo0.5%Incomplete List of Disallowed Inputs (CWE-184)
CVE-2024-81767.5 highNo1.4%Uncontrolled Recursion (CWE-674)
CVE-2025-593757.5 highNo1.4%Allocation of Resources Without Limits or Throttling (CWE-770)

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/>=12.7.1|<=12.7.7, vers:RTU500_series_CMU_Firmware/>=13.5.1|<=13.5.4, vers:RTU500_series_CMU_Firmware/>=13.6.1|<=13.6.2, vers:RTU500_series_CMU_Firmware/>=13.7.1|<=13.7.7, 13.8.1—

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. February 24, 2026: Initial public release
  2. March 3, 2026: CISA Republication - Initial CISA Republication of Hitachi Energy PSIRT 8DBD000237 advisory
  3. May 26, 2026: Updated fixed version 13.8.2
  4. September 29, 2026: Updated fixed version 12.7.8
  5. October 20, 2026: Update A - CISA Republication update based on Hitachi Energy PSIRT 8DBD000237 advisory
  6. November 9, 2026: First collected by Watch

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