CVE-2021-26370

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-10 · updated 2026-06-17
Weakness: CWE-20

Description

Improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and SVC_LOAD_BINARY_BY_ATTRIB in a malicious UApp or ABL may allow an attacker to overwrite arbitrary bootloader memory with SPI ROM contents resulting in a loss of integrity and availability.

Affected products

AMD Epyc 7002 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7232P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
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 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 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 7352 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7373X Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 73F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
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
AMD Epyc 7413 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7443 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7443P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7452 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7453 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7473X Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 74F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7502 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7502P Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7513 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
AMD Epyc 7532 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7542 Firmware: before romepi-sp3_1.0.0.c — fixed in romepi-sp3_1.0.0.c
AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4

How to fix

Upgrade to a fixed version: AMD Epyc 7002 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7232P Firmware romepi-sp3_1.0.0.c; AMD Epyc 7252 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7262 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7272 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7282 Firmware romepi-sp3_1.0.0.c; AMD Epyc 72F3 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7302 Firmware romepi-sp3_1.0.0.c; AMD Epyc 7302P Firmware romepi-sp3_1.0.0.c; AMD Epyc 7313 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7313P Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7343 Firmware milanpi-sp3_1.0.0.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-26370 or the next vulnerability affects your stack