Paper/Archive/CVE-2026-8065

CVE-2026-8065

Hitachi Energy RTU500 series CMU firmware — An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 end-of-life versions allows an unauthenti…

EPSS 0.5%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 42.5.425 × 208.5 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

An authentication bypass vulnerability in the firmware update endpoint of Hitachi Energy RTU500 end-of-life versions 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.

Affected

ProductAffectedFixed inSource

RTU500 series CMU firmware9.0 – < 12.012.0CNA

Scores by source

Hitachi Energy (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refpublisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch