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CVE-2026-16141— OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value

Quick assessment

Affected
OpenBMC phosphor-net-ipmid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenBMC 中的 IPMI 实现（phosphor-net-ipmid）存在一个逻辑缺陷：未认证的客户端可以强制 RAKP 消息 1 的处理器在认证对象的构造默认值被覆盖之前提前返回。随后，IPMI 服务会接受一条 RAKP 消息 3，其 HMAC 值是使用一个初始化为字符串 '0penBmc' 的固定 20 字节常量 'userKey' 以及通常可预测的 'bmcRandomNum' 计算得出的。多家下游厂商（如 NVIDIA 和 H3C）都将 phosphor-net-ipmid 作为其 IPMI 协议栈使

CVSS 8.1 · High
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I. Basic Information for CVE-2026-16141

Vulnerability Information
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Vulnerability Title
OpenBMC IPMI Authentication Bypass via Default userKey and Stale Challenge Value
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenBMC phosphor-net-ipmid 0 ~ ba6efc502e6b1fabb8ed1ca677ae5eedd64b6361 -

II. Public POCs for CVE-2026-16141

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III. Intelligence Information for CVE-2026-16141

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Security Blog Posts for CVE-2026-16141 (1)

Vendor Pages for CVE-2026-16141 (1)

IV. Related Vulnerabilities

Same product: phosphor-net-ipmid
Same vendor: OpenBMC
Same weakness: CWE-798

V. Comments for CVE-2026-16141

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