CVE-2021-46768

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% 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-125

Description

Insufficient input validation in SEV firmware may allow an attacker to perform out-of-bounds memory reads within the ASP boot loader, potentially leading to a denial of service.

Affected products

AMD Milanpi Firmware: before 1.0.0.5 — fixed in 1.0.0.5
AMD Romepi Firmware: before 1.0.0.d — fixed in 1.0.0.d

How to fix

Upgrade to a fixed version: AMD Milanpi Firmware 1.0.0.5; AMD Romepi Firmware 1.0.0.d. Check the vendor advisory for mitigations.

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

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