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CVE-2021-3972

MediumPublished

A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly not deactivated...

Published: Apr 22, 2022
Updated: Aug 3, 2024
Assigning CNA: lenovo
Evidence observed: Aug 25, 2026

Primary CVSS

6.7/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

3.0%

Low · next 30 days

Percentile: 86.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly not deactivated may allow an attacker with elevated privileges to modify secure boot setting by modifying an NVRAM variable.

Sources

CVE-2021-3972PoC
Proof-of-concept exploit for CVE-2021-3972, demonstrating UEFI firmware variable manipulation to disable Secure Boot and change legacy boot settings.

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