CVE-2021-26331

7.8 HIGH 0.3% exploit odds Fix listed

What it is

AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox entries leading to arbitrary code execution.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-11-16 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:43 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 7.8 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-11-16 19:15 UTC
Last modified: 2026-06-17 03:43 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Modified

Affected

Amd Epyc 7003 Firmware < milanpi-sp3_1.0.0.4
Amd Epyc 7002 Firmware < romepi-sp3_1.0.0.c
Amd Epyc 7001 Firmware < naplespi-sp3_1.0.0.g
Amd Epyc 72f3 Firmware < milanpi-sp3_1.0.0.4
Amd Epyc 7313 Firmware < milanpi-sp3_1.0.0.4
Amd Epyc 7313p Firmware < milanpi-sp3_1.0.0.4
Amd Epyc 7343 Firmware < milanpi-sp3_1.0.0.4
Amd Epyc 73f3 Firmware < milanpi-sp3_1.0.0.4

Attack profile CVSS 3.1 · 7.8

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

Raw vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-2021-26331.md and follow it. Check whether this project is affected by CVE-2021-26331. 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