CVE-2021-26355: AMD Epyc 7003 Firmware

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

Affected products

• AMD Epyc 7003 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 72f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7313 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7313p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7343 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7373x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 73f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7413 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7443 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7443p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7453 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 74f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7513 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7543p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7573x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 75f3 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7643 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7663 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7713 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7713p Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7743 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7763 Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)
• AMD Epyc 7773x Firmware: before milanpi-sp3_1.0.0.7 (fixed in milanpi-sp3_1.0.0.7)

Published 2023-01-11. Last modified 2026-06-17.