AMD EPYC 7003 Processors CPU Microcode cleanup

CVSS Meta Temp Score
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CTI Interest Score
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2.7$0-$5k0.00

Summaryinfo

A vulnerability was found in AMD EPYC 7003 Processors, EPYC 9004 Processors, EPYC 8004 Processors, Ryzen Threadripper PRO 5000 WX-Series Processors, Ryzen 5000 Mobile Processors with Radeon Graphics, Ryzen 7035 Processors with Radeon Graphics, Ryzen 5000 Desktop Processors, Ryzen 7000 Desktop Processors, Ryzen 7040 Mobile Processors with Radeon Graphics, Ryzen 6000 Processors with Radeon Graphics, Ryzen 7045 Mobile Processors with Radeon Graphics, Ryzen Threadripper PRO 3000 WX-Series Processors, Ryzen 7030 Mobile Processors with Radeon Graphics, Ryzen 8000 Desktop Processors, EPYC Embedded 7003 Processors, EPYC Embedded 9004 Processors, Ryzen Embedded 8000 Processors, Ryzen Embedded 7000 Processors, Ryzen Embedded 5000 Processors and Ryzen Embedded V3000 Processors. It has been declared as problematic. This affects an unknown function of the component CPU Microcode Handler. Such manipulation leads to cleanup. This vulnerability is listed as CVE-2024-21977. The attack must be carried out locally. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in AMD EPYC 7003 Processors, EPYC 9004 Processors, EPYC 8004 Processors, Ryzen Threadripper PRO 5000 WX-Series Processors, Ryzen 5000 Mobile Processors with Radeon Graphics, Ryzen 7035 Processors with Radeon Graphics, Ryzen 5000 Desktop Processors, Ryzen 7000 Desktop Processors, Ryzen 7040 Mobile Processors with Radeon Graphics, Ryzen 6000 Processors with Radeon Graphics, Ryzen 7045 Mobile Processors with Radeon Graphics, Ryzen Threadripper PRO 3000 WX-Series Processors, Ryzen 7030 Mobile Processors with Radeon Graphics, Ryzen 8000 Desktop Processors, EPYC Embedded 7003 Processors, EPYC Embedded 9004 Processors, Ryzen Embedded 8000 Processors, Ryzen Embedded 7000 Processors, Ryzen Embedded 5000 Processors and Ryzen Embedded V3000 Processors. It has been rated as problematic. Affected by this issue is some unknown processing of the component CPU Microcode Handler. The manipulation with an unknown input leads to a cleanup vulnerability. Using CWE to declare the problem leads to CWE-459. The product does not properly "clean up" and remove temporary or supporting resources after they have been used. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at amd.com. This vulnerability is handled as CVE-2024-21977 since 01/03/2024. The exploitation is known to be easy. The attack needs to be approached locally. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2025-1770). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Ubuntu Linux
  • Oracle Linux
  • Dell PowerEdge
  • Lenovo Computer
  • HP Computer
  • AMD Prozessor

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.7
VulDB Meta Temp Score: 2.7

VulDB Base Score: 2.3
VulDB Temp Score: 2.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.2
CNA Vector (AMD): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cleanup
CWE: CWE-459
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

01/03/2024 CVE reserved
09/05/2025 +610 days Advisory disclosed
09/05/2025 +0 days VulDB entry created
12/13/2025 +99 days VulDB entry last update

Sourcesinfo

Advisory: amd.com
Status: Confirmed

CVE: CVE-2024-21977 (🔒)
GCVE (CVE): GCVE-0-2024-21977
GCVE (VulDB): GCVE-100-322748
CERT Bund: WID-SEC-2025-1770 - AMD Prozessoren: Mehrere Schwachstellen

Entryinfo

Created: 09/05/2025 15:20
Updated: 12/13/2025 16:49
Changes: 09/05/2025 15:20 (61), 12/13/2025 16:49 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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