CVE-2023-31347: AMD Epyc 7203 Firmware

Medium severity, CVSS 4.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Due to a code bug in Secure_TSC, SEV firmware may allow an attacker with high privileges to cause a guest to observe an incorrect TSC when Secure TSC is enabled potentially resulting in a loss of guest integrity.

Affected products

AMD Epyc 7203 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7203p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 72f3 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7303 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7303p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7313 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7313p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7343 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7373x Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 73f3 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7413 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7443 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7443p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7453 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7473x Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 74f3 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7513 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7543 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7543p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7573x Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 75f3 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7643 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7643p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7663 Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
AMD Epyc 7663p Firmware: before milanpi_1.0.0.c (fixed in milanpi_1.0.0.c)
and 37 more

Published 2024-02-13. Last modified 2026-06-17.