CVE-2023-20578: amd epyc_7001_firmware

Vulnerability summary

CVE-2023-20578 is a high (CVSS 7.5) vulnerability in amd epyc_7001_firmware. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.5% of scored vulnerabilities.

Timeline

1. 13-08-2024
   PublishedVulnerability first disclosed.
2. 18-03-2025
   Last modifiedVulnerability information updated.

Description

A TOCTOU (Time-Of-Check-Time-Of-Use) in SMM may allow an attacker with ring0 privileges and access to the BIOS menu or UEFI shell to modify the communications buffer potentially resulting in arbitrary code execution.

• CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionThe product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.