CVE-2021-3970

Description

A potential vulnerability in LenovoVariable SMI Handler due to insufficient validation in some Lenovo Notebook models BIOS may allow an attacker with local access and elevated privileges to execute arbitrary code.

Remediation

Solution:

  • Update system firmware to the version (or newer) indicated for your model in the Product Impact section of LEN-73440.

Category

6.7
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.46%
Vendor Advisory lenovo.com
Affected: Lenovo Notebook BIOS
Published at:
Updated at:

References

Link Tags
https://support.lenovo.com/us/en/product_security/LEN-73440 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-3970?
CVE-2021-3970 has been scored as a medium severity vulnerability.
How to fix CVE-2021-3970?
To fix CVE-2021-3970: Update system firmware to the version (or newer) indicated for your model in the Product Impact section of LEN-73440.
Is CVE-2021-3970 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-3970 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-3970?
CVE-2021-3970 affects Lenovo Notebook BIOS.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.