CVE-2026-8066: critical vulnerability in Hitachi Energy RTU500 series CMU firmware
Published
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.1epss 0.7%
exploitation probability
0.7%top 47% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected products
Hitachi Energy · RTU500 series CMU firmwareRelated CVEs — Hitachi Energy RTU500 series CMU firmware
In the same product, most dangerous first.