CVE-2024-21977
AMD SEV-SNP RDRAND Entropy Depletion Vulnerability
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.
INFO
Published Date :
Sept. 5, 2025, 1:15 p.m.
Last Modified :
Sept. 5, 2025, 5:47 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2024-21977
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | b58fc414-a1e4-4f92-9d70-1add41838648 | ||||
| CVSS 3.1 | LOW | [email protected] |
Solution
- Apply the latest CPU microcode updates.
- Verify complete cleanup after patch loading.
- Ensure SEV-SNP guest integrity.
Public PoC/Exploit Available at Github
CVE-2024-21977 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-21977.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-21977 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-21977
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
EPSS & VEDAS Score Aggregator for CVEs
cve vulnerability exploit epss vedas exploit-maturity
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-21977 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-21977 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Sep. 05, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N Added CWE CWE-459 Added Reference https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3014.html Added Reference https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html Added Reference https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html