Vulnerability in Hitachi Energy RTU500 series CMU firmware

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.1

[ Description ]Official description

A directory traversal vulnerability in the file upload functionality of Hitachi Energy RTU500 end-of-life versions allows an unauthenticated attacker to write or overwrite arbitrary files on the device file system. Depending on the files affected, successful exploitation could result in unauthorized modification of device data or disruption of the device’s intended operation.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3658

  Hitachi Energy RTU500: Multiple vulnerabilities Translated from German

  CVE-2023-46143CVE-2010-2965CVE-2026-8065+3 more CVEs

[ References ]References

• publisher.hitachienergy.com/preview