{"id":"CVE-2026-8065","state":"PUBLISHED","title":"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","description":"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.","publishedAt":"2026-09-29T09:20:07.276Z","updatedAt":"2026-09-29T15:54:11.550Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","source":"Hitachi Energy"},"assigner":"Hitachi Energy","products":["Hitachi Energy RTU500 series CMU firmware"],"affected":[{"vendor":"Hitachi Energy","product":"RTU500 series CMU firmware","defaultStatus":"unaffected","versions":[{"version":"9.0","status":"affected","lessThan":"12.0","versionType":"custom"}]}],"references":["https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch"],"weaknesses":["CWE-306"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/8xxx/CVE-2026-8065.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-8065","state":"PUBLISHED","datePublished":"2026-09-29T09:20:07.276Z","dateUpdated":"2026-09-29T15:54:11.550Z","assignerShortName":"Hitachi Energy","assignerOrgId":"e383dce4-0c27-4495-91c4-0db157728d17","dateReserved":"2026-05-07T05:51:56.353Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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":[{"vendor":"Hitachi Energy","product":"RTU500 series CMU firmware","defaultStatus":"unaffected","versions":[{"version":"9.0","status":"affected","lessThan":"12.0","versionType":"custom"}]}],"references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000251&LanguageCode=en&DocumentPartId=&Action=Launch"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"CRITICAL","baseScore":9.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306 Missing authentication for critical function","type":"CWE"}]}],"providerMetadata":{"shortName":"Hitachi Energy","orgId":"e383dce4-0c27-4495-91c4-0db157728d17","dateUpdated":"2026-09-29T12:50:06.355Z"},"impacts":[{"capecId":"CAPEC-638","descriptions":[{"lang":"en","value":"CAPEC-638 Altered Component Firmware"}]}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.5.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-29T15:53:38.135052Z","id":"CVE-2026-8065","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-29T15:54:11.550Z"}}]}}}