What is the CVSS score of CVE-2021-39296?

CVE-2021-39296 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 3.0%.

Is there a public PoC exploit available for CVE-2021-39296?

Yes, a public proof-of-concept exploit is available for CVE-2021-39296. Prioritise patching immediately. EPSS: 3.0%.

Openbmc CVE-2021-39296

CRITICAL

Improper Authentication (CWE-287)

2021-09-09 cve@mitre.org

Authentication Bypass Openbmc

10.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

10.0 CRITICAL

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Sep 09, 2021 - 18:15 nvd

CRITICAL 10.0

DescriptionNVD

In OpenBMC 2.9, crafted IPMI messages allow an attacker to bypass authentication and gain full control of the system.

AnalysisAI

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.

Technical ContextAI

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.

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.