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Vulnerability record · CVE-2021-4212 · published 22 April 2022

CVE-2021-4212: Lenovo c340-14iml firmware improper input validation vulnerability

Lenovo · C340 14iml Firmware

A potential vulnerability in the SMI callback function used in the Legacy BIOS mode driver in some Lenovo Notebook models may allow an attacker with local access and elevated privileges to execute arbitrary code.

6.7 CVSS 3.1 Medium EPSS 0.26% · top 83.4% CWE-20 · Improper input validation
6.7CVSS 3.1 base score, v2 7.2
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
62Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A potential vulnerability in the SMI callback function used in the Legacy BIOS mode driver in some Lenovo Notebook models may allow an attacker with local access and elevated privileges to execute arbitrary code.

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

Affected products

62 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.lenovo.com/us/en/product_security/LEN-77639 PatchVendor Advisory
https://support.lenovo.com/us/en/product_security/LEN-77639 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-4212), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.