What is the CVSS score of CVE-2021-26318?

CVE-2021-26318 has a CVSS 3.1 base score of 4.7 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Athlon Firmware CVE-2021-26318

MEDIUM

Observable Timing Discrepancy (CWE-208)

2021-10-13 psirt@amd.com

Amd Information Disclosure Athlon Firmware Athlon Pro Firmware Epyc Firmware Ryzen Firmware Ryzen Pro Firmware

4.7

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

4.7 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

CVE Published

Oct 13, 2021 - 19:15 nvd

MEDIUM 4.7

DescriptionNVD

A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.

AnalysisAI

A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information. Rated medium severity (CVSS 4.7). No vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-208. A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information. Affected products include: Amd Athlon Firmware, Amd Athlon Pro Firmware, Amd Epyc Firmware, Amd Ryzen Firmware, Amd Ryzen Pro Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.