CVE-2024-21977 Other in AMD EPYC™ 7003 Series Processors
A privileged attacker can degrade RDRAND entropy via incomplete microcode cleanup, compromising SEV-SNP guest integrity on AMD processors.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-21977?
CVE-2024-21977 is a low-severity vulnerability in AMD EPYC™ 7003 Series Processors, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.
Weakness: CWE-459
Which versions are affected by CVE-2024-21977?
How do I fix CVE-2024-21977?
No fix has been published for CVE-2024-21977 yet. Limit exposure of the affected software until one is available.
Is CVE-2024-21977 being exploited?
There is no known exploitation of CVE-2024-21977 in the wild and no public exploit code.
Sources
Also known as GHSA-hw87-hg67-xw42.