CVE-2021-26404 Information disclosure in 3rd Gen EPYC

Medium 5.5 Published 10 Jan 2023 Updated 8 Apr 2025

Improper input validation in AMD SEV firmware may leak scratch buffer bytes, potentially disclosing sensitive information to attackers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-26404?

CVE-2021-26404 is a medium-severity vulnerability in Amd Epyc 7313 Firmware, published on 10 Jan 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Improper input validation and bounds checking in SEV firmware may leak scratch buffer bytes leading to potential information disclosure.

Weakness: CWE-20

Which versions are affected by CVE-2021-26404?

It affects 23 products.

Products include Amd Epyc 7003 Firmware, Amd Epyc 7313 Firmware, Amd Epyc 7313p Firmware, Amd Epyc 7343 Firmware, Amd Epyc 7373x Firmware, Amd Epyc 73f3 Firmware and 17 more.

How do I fix CVE-2021-26404?

No fix has been published for CVE-2021-26404 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-26404 being exploited?

There is no known exploitation of CVE-2021-26404 in the wild and no public exploit code.

All Amd Epyc 7313 Firmware vulnerabilities

Sources

Also known as GHSA-m5wf-22jj-7772.