CVE-2021-3786

4.4 MEDIUM 0.2% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine with an admin-level account. High risk of service disruption.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-11-12 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 04:05 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.2% in the next 30 days (EPSS).
Severity: 4.4 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-11-12 22:15 UTC
Last modified: 2026-06-17 04:05 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Modified

Affected

Lenovo Thinkpad x380 Yoga Firmware < 2020-10-31
Lenovo Thinkpad x1 Fold Gen 1 Firmware < 2021-10-29
Lenovo Thinkpad Yoga 260 Firmware < 2021-10-25
Lenovo Thinkpad Yoga 11e 3rd Gen Firmware < 2021-10-31
Lenovo Thinkpad Yoga 15 Firmware < n19et66w
Lenovo Thinkpad Yoga 370 Firmware < 2021-10-31
Lenovo Thinkpad x12 Detachable Gen 1 Firmware < 2021-10-31
Lenovo Thinkpad x390 Firmware < n2jet96w

Attack profile CVSS 3.1 · 4.4

Attack vector: Local
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-3786.md and follow it. Check whether this project is affected by CVE-2021-3786. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record