CVE-2021-26331: AMD Epyc 7001 Firmware

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox entries leading to arbitrary code execution.

Affected products

• AMD Epyc 7001 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7002 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7003 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7232p Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7251 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7252 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7262 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7272 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7281 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7282 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 72f3 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7301 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7302 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7302p Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7313 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7313p Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7343 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7351 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7351p Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7352 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 73f3 Firmware: before milanpi-sp3_1.0.0.4 (fixed in milanpi-sp3_1.0.0.4)
• AMD Epyc 7401 Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7401p Firmware: before naplespi-sp3_1.0.0.g (fixed in naplespi-sp3_1.0.0.g)
• AMD Epyc 7402 Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• AMD Epyc 7402p Firmware: before romepi-sp3_1.0.0.c (fixed in romepi-sp3_1.0.0.c)
• and 33 more

Published 2021-11-16. Last modified 2026-06-17.