Openbmc
CVE-2021-39296
CRITICAL
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK
2 techniques across 2 tactics: Defense Evasion, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 10.0 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system. Rated critical severity (CVSS 10.0), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system. Affected products include: Openbmc-Project Openbmc.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionNVD
In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
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.
Affected Products (CPE)NVD
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
An authentication bypass in OpenBMC's phosphor-net-ipmid IPMI stack lets a network attacker with no credentials complete
A vulnerability in the combination of the OpenBMC's FW1050.00 through FW1050.10, FW1030.00 through FW1030.50, and FW1020
IBM OpenBMC FW1050.00 through FW1050.10 BMCWeb HTTPS server component could disclose sensitive URI content to an unautho
A vulnerability in bmcweb of OpenBMC Project allows user to cause denial of service. Rated high severity (CVSS 7.5), thi
A vulnerability in bmcweb of OpenBMC Project allows user to cause denial of service. Rated high severity (CVSS 7.5), thi
Arbitrary code execution in IBM OpenBMC FW1060.00 through FW1060.80 is achievable via a path traversal flaw (CWE-22) in
Incorrect privilege assignment in Huawei openUBMC causes the SNMP pseudo-identity group (special_users, including the SN
Denial-of-service exposure in IBM OpenBMC firmware versions FW1110.00 through FW1110.11 allows unauthenticated remote at
Out-of-bounds memory reads in the openUBMC device-management process can be induced by a malicious or compromised device
A limited out-of-bounds memory read in the host-facing BMC firmware management service of IBM OpenBMC can be triggered b
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