CVE-2021-46791 Memory corruption in 3rd Gen EPYC

Medium 5.5 Published 10 Jan 2023 Updated 9 Apr 2025

A malicious SMM binary can corrupt memory in AMD EPYC systems, causing a denial of service.

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-2021-46791?

CVE-2021-46791 is a medium-severity memory corruption vulnerability in AMD 3rd Gen EPYC, 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

Insufficient input validation during parsing of the System Management Mode (SMM) binary may allow a maliciously crafted SMM executable binary to corrupt Dynamic Root of Trust for Measurement (DRTM) user application memory that may result in a potential denial of service.

Weakness: CWE-787

Which versions are affected by CVE-2021-46791?

It affects 1 product.

Products include Amd Milanpi Firmware.

How do I fix CVE-2021-46791?

No fix has been published for CVE-2021-46791 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-46791 being exploited?

There is no known exploitation of CVE-2021-46791 in the wild and no public exploit code.

Sources

Also known as GHSA-669j-rxfq-2fvw.