CVE-2026-16141OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
Updated under an hour ago ()
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It affects OpenBMC phosphor-net-ipmid. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-798, CWE-457
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- runZero
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OpenBMC phosphor-net-ipmid openbmc:phosphor_net_ipmid (from the name) | through ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361 | CNA record |
References
- https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/third-party-advisory
- https://www.runzero.com/blog/lights-out-exposed/related
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.