CVE-2026-8065
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 allows an unauthenticated attacker to upload arbitrary firmware through a crafted POST request. Successful exploitation could allow the attacker to modify device functionality or compromise the integrity or availability of the device.
| CWE | CWE-306 |
| Vendor | hitachi energy |
| Product | rtu500 series cmu firmware |
| Published | Sep 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High
Affected Versions
Hitachi Energy / RTU500 series CMU firmware
9.0 < 12.0