What is the CVSS score of CVE-2026-0421?

CVE-2026-0421 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Secure Boot are affected by CVE-2026-0421?

Organizations using A potential vulnerability should be aware of notable risk from CVE-2026-0421 rated CVSS 6.5. Exploitation could compromise the security of affected deployments.

How to fix or mitigate CVE-2026-0421?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Secure Boot CVE-2026-0421

MEDIUM

Unchecked Return Value (CWE-252)

2026-01-14 psirt@lenovo.com

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 14, 2026 - 23:15 nvd

MEDIUM 6.5

DescriptionCVE.org

A potential vulnerability was reported in the BIOS of L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2 ThinkPads which could result in Secure Boot being disabled even when configured as “On” in the BIOS setup menu. This issue only affects systems where Secure Boot is set to User Mode.

AnalysisAI

Secure Boot bypass in iOS allows local privileged users to disable Secure Boot protections even when explicitly configured as enabled in BIOS, affecting systems with Secure Boot set to User Mode. An attacker with high-level system access and user interaction can circumvent boot-time security protections, potentially enabling unsigned code execution. No patch is currently available for this medium-severity vulnerability.

Technical ContextAI

Classified as CWE-252 (Unchecked Return Value). A potential vulnerability was reported in the BIOS of L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2 ThinkPads which could result in Secure Boot being disabled even when configured as “On” in the BIOS setup menu. This issue only affects systems where Secure Boot is set to User Mode.

Affected ProductsAI

A potential vulnerability was reported in the BIOS of L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2 ThinkPads which could result in Secure Boo