CVE-2024-21977

LOW

Published Sep 5, 2025 Modified Apr 15, 2026 CWE-459

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.

CVSS v3.1 Score

3.2

LOW

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N

Weakness Type (CWE)

CWE-459 CWE-459

References

Other References

https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3014.html https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html

Frequently Asked Questions

What is CVE-2024-21977? +

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. It has a CVSS v3.1 base score of 3.2 (LOW).

How severe is CVE-2024-21977? +

CVE-2024-21977 has a CVSS v3.1 score of 3.2 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

How do I check if I'm vulnerable to CVE-2024-21977? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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