# CVE-2026-16141

## Summary

- **CVE ID:** CVE-2026-16141
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-798, CWE-457
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- OpenBMC — phosphor-net-ipmid (0)

## References

- [CNA](https://www.runzero.com/advisories/openbmc-ipmi-auth-bypass-rakp-cve-2026-16141/)
- [CNA](https://www.runzero.com/blog/lights-out-exposed/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.39%
- **EPSS Percentile:** 33.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._