EUVD-2026-78573
GHSA-28w7-pg33-g2hj
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Credential externalization
MITRE ATT&CK
2 techniques across 2 tactics: Persistence, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Sep 15, 2026
An authentication bypass in OpenBMC's phosphor-net-ipmid IPMI stack lets a network attacker with no credentials complete IPMI 2.0 RAKP session authentication and obtain full BMC control. A crafted RAKP Message 1 forces the handler to return before the authentication object's constructor defaults are overwritten, so the service accepts a RAKP Message 3 whose HMAC is keyed with the hard-coded 20-byte 'userKey' derived from the string '0penBmc' combined with an often-predictable 'bmcRandomNum'. The flaw affects downstream vendors that ship phosphor-net-ipmid as their IPMI implementation, including NVIDIA and H3C, and runZero published a public advisory; no CISA KEV entry or EPSS score was supplied, and no patched version was identified in the provided data.
Affected VersionsENISA
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Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (runZero) · only source for this CVE.
CVSS VectorVendor: runZero
DescriptionCVE.org
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.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
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What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.
In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system. Ra
Privilege escalation in OpenBMC's phosphor-net-ipmid IPMI stack allows an attacker who already holds a valid low-privile
user_channel/passwd_mgr.cpp in OpenBMC phosphor-host-ipmid before 2020-04-03 does not ensure that /etc/ipmi-pass has str
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A vulnerability in bmcweb of OpenBMC Project allows user to cause denial of service. Rated high severity (CVSS 7.5), thi
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