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Vulnerability record · CVE-2021-3786 · published 12 November 2021

CVE-2021-3786: Lenovo thinkpad x380 yoga firmware improper input validation vulnerability

Lenovo · Thinkpad X380 Yoga Firmware

A potential vulnerability in the SMI callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.

5.5 CVSS 3.1 Medium EPSS 0.23% · top 86.8% CWE-20 · Improper input validation
5.5CVSS 3.1 base score, v2 2.1
0.23%EPSS exploitation probability, 30 days
NoNot in CISA KEV
133Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A potential vulnerability in the SMI callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.

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

Affected products

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

References

LinkTags
https://support.lenovo.com/us/en/product_security/LEN-67440 PatchVendor Advisory
https://support.lenovo.com/us/en/product_security/LEN-67440 PatchVendor Advisory

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Related vulnerabilities

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

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Source: NIST National Vulnerability Database (record CVE-2021-3786), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.