CVE-2021-3972

A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo...

6.7 MediumPublic exploit

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.86%Up 2.0 points since Apr 23, 2022

What each source reports

CVE List Score used 6.7

Record: CVE-2021-3972
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-489
Updated: 2026-11-02

EUVDEUVD-2021-27177 6.7

Record: EUVD-2021-27177
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-h8xq-rx7h-94j2 6.7

A potential vulnerability by a driver used during manufacturing process on some consumer Lenovo...

Record: GHSA-h8xq-rx7h-94j2
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

NVD 6.7

Record: CVE-2021-3972
CVSS 3.1: 6.7 MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 4.6 MediumAV:L/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-489
Updated: 2026-11-02

Affected products

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Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	killvxk/CVE-2021-3972	2022-04-21

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3972 is a medium vulnerability (CVSS 6.7) in Lenovo Ideapad 3-14ada05 Firmware, published April 22, 2022. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 2.86%, the 86th percentile. No source names a fixed version.