CVE-2021-26356: AMD Epyc 7001 Firmware

High severity, CVSS 7.4. EPSS: 0.4% chance of exploitation in the next 30 days.

A TOCTOU in ASP bootloader may allow an attacker to tamper with the SPI ROM following data read to memory potentially resulting in S3 data corruption and information disclosure.

Affected products

AMD Epyc 7001 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7002 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7232p Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7251 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7252 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7261 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7262 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7272 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7281 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7282 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 72f3 Firmware: before milanpi_1.0.0.6 (fixed in milanpi_1.0.0.6)
AMD Epyc 7301 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7302 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7302p Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7313 Firmware: before milanpi_1.0.0.6 (fixed in milanpi_1.0.0.6)
AMD Epyc 7313p Firmware: before milanpi_1.0.0.6 (fixed in milanpi_1.0.0.6)
AMD Epyc 7343 Firmware: before milanpi_1.0.0.6 (fixed in milanpi_1.0.0.6)
AMD Epyc 7351 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7351p Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7352 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
AMD Epyc 7371 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7373x Firmware: before milanpi_1.0.0.6 (fixed in milanpi_1.0.0.6)
AMD Epyc 7401 Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7401p Firmware: before naplespi_1.0.0.h (fixed in naplespi_1.0.0.h)
AMD Epyc 7402 Firmware: before romepi_1.0.0.d (fixed in romepi_1.0.0.d)
and 73 more

Published 2023-05-09. Last modified 2026-06-17.