CVE-2026-16141
OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-798 CWE-457 |
| Vendor | openbmc |
| Product | phosphor-net-ipmid |
| Published | Sep 15, 2026 |
| Last Updated | Sep 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for openbmc phosphor-net-ipmid
Be the first to know when new high vulnerabilities affecting openbmc phosphor-net-ipmid are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
OpenBMC / phosphor-net-ipmid
0 ≤ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361
References
Credits
HD Moore of runZero Gadi Evron of Knostic Tod Beardsley of runZero