{"id":"CVE-2026-16141","title":"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","summary":"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 se…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-457","CWE-798"],"vendor":"OpenBMC","product":"phosphor-net-ipmid","affected":["phosphor-net-ipmid <= ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361"],"published":"2026-09-15","updated":"2026-09-18","sourceUpdated":"2026-09-18T19:30:42.730","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-16141","references":[{"url":"https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/","label":"44488dab-36db-4358-99f9-bc116477f914"},{"url":"https://www.runzero.com/blog/lights-out-exposed/","label":"44488dab-36db-4358-99f9-bc116477f914"}],"tags":["nvd","cve.org"],"epss":0.00391,"epssPercentile":0.33044,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-15T14:59:02.838838Z"},"ingestedAt":"2026-09-15T14:38:16.196Z","slug":"CVE-2026-16141","body":"## Overview\n\nOpenBMC'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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}