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// CVE · PUBLISHED 2026-09-29

CVE-2026-8066

Hitachi Energy / RTU500 series CMU firmware

9.1 · CVSS 3.1Critical

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.

References

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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.