CVE-2021-26344: AMD Epyc 7001 Firmware

High severity, CVSS 8.2. EPSS: 0.2% chance of exploitation in the next 30 days.

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modify the BIOS image, and the ability to sign the resulting image, to potentially modify the APCB block resulting in arbitrary code execution.

Affected products

AMD Epyc 7001 Firmware: affected versions not specified
AMD Epyc 7203 Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7203p Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7232p Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7251 Firmware: affected versions not specified
AMD Epyc 7252 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7261 Firmware: affected versions not specified
AMD Epyc 7262 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7272 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7281 Firmware: affected versions not specified
AMD Epyc 7282 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 72f3 Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7301 Firmware: affected versions not specified
AMD Epyc 7302 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7302p Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7303 Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7303p Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7313 Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7313p Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7343 Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
AMD Epyc 7351 Firmware: affected versions not specified
AMD Epyc 7351p Firmware: affected versions not specified
AMD Epyc 7352 Firmware: before romepi_1.0.0.c (fixed in romepi_1.0.0.c)
AMD Epyc 7371 Firmware: affected versions not specified
AMD Epyc 7373x Firmware: before milanpi_1.0.0.5 (fixed in milanpi_1.0.0.5)
and 44 more

Published 2024-08-13. Last modified 2026-06-17.