{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-16141","assignerOrgId":"44488dab-36db-4358-99f9-bc116477f914","state":"PUBLISHED","assignerShortName":"runZero","dateReserved":"2026-07-17T17:17:25.183Z","datePublished":"2026-09-15T13:57:28.846Z","dateUpdated":"2026-09-15T14:59:11.232Z"},"containers":{"cna":{"providerMetadata":{"orgId":"44488dab-36db-4358-99f9-bc116477f914","shortName":"runZero","dateUpdated":"2026-09-15T14:00:45.819Z"},"title":"OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value","datePublic":"2026-09-15T14:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-798","description":"CWE-798 Use of Hard-coded Credentials","type":"CWE"},{"lang":"en","cweId":"CWE-457","description":"CWE-457 Use of Uninitialized Variable","type":"CWE"}]}],"affected":[{"vendor":"OpenBMC","product":"phosphor-net-ipmid","repo":"https://github.com/openbmc/phosphor-net-ipmid","versions":[{"status":"affected","version":"0","lessThanOrEqual":"ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361","versionType":"git"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C.","supportingMedia":[{"type":"text/html","base64":false,"value":"OpenBMC's IPMI implementation, phosphor-net-ipmid, contains a logic flaw in which an unauthenticated client can force the RAKP Message 1 handler to return before it overwrites the authentication object's constructor defaults. The IPMI service then accepts a RAKP Message 3 whose HMAC is computed with the constant 20-byte 'userKey' initialized from the string '0penBmc' and an often-predictable 'bmcRandomNum'. Several downstream vendors implement phosphor-net-ipmid as their IPMI stack, such as NVIDIA and H3C. "}]}],"references":[{"url":"https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/","tags":["third-party-advisory"]},{"url":"https://www.runzero.com/blog/lights-out-exposed/","tags":["related"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":8.1,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}}],"credits":[{"lang":"en","value":"HD Moore of runZero","type":"finder"},{"lang":"en","value":"Gadi Evron of Knostic","type":"finder"},{"lang":"en","value":"Tod Beardsley of runZero","type":"coordinator"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T14:59:02.838838Z","id":"CVE-2026-16141","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-15T14:59:11.232Z"}}]}}