CVE-2021-26402

HIGH

AMD EPYC 7002 Series Firmware - Out-of-bounds Write via BIOS Mailbox Command Handling

Title source: llm
STIX 2.1

Description

Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.

References (1)

Core 1
Core References

Scores

CVSS v3 7.1
EPSS 0.0005
EPSS Percentile 16.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (50)
amd/epyc_7002_firmware < romepi_1.0.0.c
amd/epyc_7003_firmware < milanpi_1.0.0.4
amd/epyc_7232p_firmware < romepi_1.0.0.c
amd/epyc_7252_firmware < romepi_1.0.0.c
amd/epyc_7262_firmware < romepi_1.0.0.c
amd/epyc_7272_firmware < romepi_1.0.0.c
amd/epyc_7282_firmware < romepi_1.0.0.c
amd/epyc_72f3_firmware < milanpi_1.0.0.4
amd/epyc_7302_firmware < romepi_1.0.0.c
amd/epyc_7302p_firmware < romepi_1.0.0.c
... and 40 more
Published Jan 11, 2023
Tracked Since Feb 18, 2026