Low severity · published Sep 5, 2025
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…
3.2
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AE
AMD EPYC™ 7003 Series Processors · AMD
All versions, or not specified · source: vendor
AE
AMD EPYC™ 8004 Series Processors · AMD
All versions, or not specified · source: vendor
AE
AMD EPYC™ 9004 Series Processors · AMD
All versions, or not specified · source: vendor
AE
AMD EPYC™ Embedded 7003 Series Processors · AMD
All versions, or not specified · source: vendor
AE
AMD EPYC™ Embedded 9004 Series Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 5000 Series Desktop Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 7000 Series Desktop Processors · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 7030 Series Mobile Processors with Radeon™ Graphics · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics · AMD
All versions, or not specified · source: vendor
AR
AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics · AMD
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-21977
CVE.org
https://www.cve.org/CVERecord?id=CVE-2024-21977
www.amd.com
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3014.html
www.amd.com
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html
www.amd.com
https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html
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