CVE-2021-46768 Denial of service in 2nd Gen EPYC

Medium 5.5 Published 10 Jan 2023 Updated 9 Apr 2025

Insufficient input validation in AMD SEV firmware allows attackers to cause denial of service via out-of-bounds memory reads in the ASP boot loader.

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-2021-46768?

CVE-2021-46768 is a medium-severity denial of service vulnerability in 2nd 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 in SEV firmware may allow an attacker to perform out-of-bounds memory reads within the ASP boot loader, potentially leading to a denial of service.

Weakness: CWE-125

Which versions are affected by CVE-2021-46768?

It affects 2 products.

Products include Amd Milanpi Firmware, Amd Romepi Firmware.

How do I fix CVE-2021-46768?

No fix has been published for CVE-2021-46768 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-46768 being exploited?

There is no known exploitation of CVE-2021-46768 in the wild and no public exploit code.

Sources

Also known as GHSA-99q2-r8wp-gv52.