CVE-2021-46795

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-01-11 · updated 2026-06-17
Weakness: CWE-367

Description

A TOCTOU (time-of-check to time-of-use) vulnerability exists where an attacker may use a compromised BIOS to cause the TEE OS to read memory out of bounds that could potentially result in a denial of service.

Affected products

AMD Cezannepi-Fp6 Firmware: before 1.0.0.6 — fixed in 1.0.0.6
AMD Comboam4V2 Pi Firmware: before 1.2.0.5 — fixed in 1.2.0.5
AMD Renoirpi-Fp6 Firmware: before 1.0.0.7 — fixed in 1.0.0.7

How to fix

Upgrade to a fixed version: AMD Cezannepi-Fp6 Firmware 1.0.0.6; AMD Comboam4V2 Pi Firmware 1.2.0.5; AMD Renoirpi-Fp6 Firmware 1.0.0.7. Check the vendor advisory for mitigations.

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1031
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1031

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