Hitachi Energy RTU500 Product: 9 CVEs, High 8.8
Summary
CISA reports 9 vulnerabilities in Hitachi Energy RTU500 series CMU Firmware. Weakness types: NULL Pointer Dereference, Access of Resource Using Incompatible Type ('Type Confusion'), Use After Free (+4 more). 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. Highest CVSS v3 score: 8.8 (High), exploitable over the network.
At a glance
- Vendor
- Hitachi Energy
- Products
- RTU500 series CMU Firmware
- CVEs
- 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
- Highest CVSS v3
- 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Highest CVSS v4
- –
- Known exploited (KEV)
- No CVE from this advisory is on the KEV list as of the last refresh
- Sectors (per CISA)
- Energy
- Deployed
- Worldwide
- Vendor HQ
- Switzerland
Vulnerabilities
| CVE | Weakness | CVSS v3 | CVSS v4 | KEV | Description (from advisory) |
|---|---|---|---|---|---|
| CVE-2026-17539 | NULL Pointer Dereference | 5.9 | – | No | CVE-2026-17539 |
| CVE-2026-28388 | NULL Pointer Dereference | 7.5 | – | No | CVE-2026-28388 |
| CVE-2026-6732 | Access of Resource Using Incompatible Type ('Type Confusion') | 7.5 | – | No | CVE-2026-6732 |
| CVE-2026-6653 | Use After Free | 8.8 | – | No | CVE-2026-6653 |
| CVE-2026-6276 | Cleartext Transmission of Sensitive Information | 7.5 | – | No | CVE-2026-6276 |
| CVE-2026-9079 | Insufficiently Protected Credentials | 5.3 | – | No | CVE-2026-9079 |
| CVE-2026-11856 | Authentication Bypass by Capture-replay | 8.1 | – | No | CVE-2026-11856 |
| CVE-2026-8927 | Authentication Bypass by Capture-replay | 5.3 | – | No | CVE-2026-8927 |
| CVE-2026-8932 | Authentication Bypass by Primary Weakness | 7.5 | – | No | CVE-2026-8932 |
Affected products (5)
- RTU500 series CMU Firmware version 13.5.1 – 13.5.4
- RTU500 series CMU Firmware version 13.6.1 – 13.6.3
- RTU500 series CMU Firmware version 13.7.1 – 13.7.8
- RTU500 series CMU Firmware version 13.8.1 – 13.8.2
- RTU500 series CMU Firmware version 12.7.1 – 12.7.7
Vendor fixes and mitigations (from advisory)
- Vendor Fix: Update to CMU Firmware version 13.9.1
- Mitigation: Follow general mitigation factors/workarounds
- Vendor Fix: Update to CMU Firmware version 13.9.1 or 13.7.9 (when available)
- Vendor Fix: Update to CMU Firmware version 13.9.1 or 13.8.3*
- Vendor Fix: Update to CMU Firmware version 12.7.8 OR
- Vendor Fix: Upgrade to CMU Firmware version 13.9.1
Also apply CISA's standard ICS practices: minimize network exposure, keep control networks behind firewalls and isolated from business networks, and use up-to-date secure remote access.
Sources
- CISA advisory ICSA-26-293-05
- Machine-readable CSAF record
- https://publisher.hitachienergy.com/preview?DocumentID=8DBD000235&LanguageCode=en&Document
- https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=en&Document
This page is generated automatically from the CISA advisory text. It is not a substitute for the vendor's guidance; verify affected versions and fixes at the source before making changes to control systems.