Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/
- https://www.runzero.com/blog/lights-out-exposed/
FAQ
What is CVE-2026-16141?
CVE-2026-16141 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 objec...
How severe is CVE-2026-16141?
CVE-2026-16141 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-16141?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.