CVE-2021-26347

Severity: medium (CVSS 4.7 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: 2022-05-11 · updated 2026-06-17
Weakness: CWE-1284

Description

Failure to validate the integer operand in ASP (AMD Secure Processor) bootloader may allow an attacker to introduce an integer overflow in the L2 directory table in SPI flash resulting in a potential denial of service.

Affected products

AMD Epyc 7002 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7232P Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7252 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7262 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7272 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7282 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 72F3 Firmware: before milanpi-sp3_1.0.0.7 — fixed in milanpi-sp3_1.0.0.7
AMD Epyc 7302 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7302P Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
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 7352 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
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 7402 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7402P Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
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 7452 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7453 Firmware: before milanpi-sp3_1.0.0.7 — fixed in milanpi-sp3_1.0.0.7
AMD Epyc 7473X 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 7502 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7502P Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7513 Firmware: before milanpi-sp3_1.0.0.7 — fixed in milanpi-sp3_1.0.0.7
AMD Epyc 7532 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7542 Firmware: before romepi-sp3_1.0.0.d — fixed in romepi-sp3_1.0.0.d
AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.7 — fixed in milanpi-sp3_1.0.0.7

How to fix

Upgrade to a fixed version: AMD Epyc 7002 Firmware romepi-sp3_1.0.0.d; AMD Epyc 7232P Firmware romepi-sp3_1.0.0.d; AMD Epyc 7252 Firmware romepi-sp3_1.0.0.d; AMD Epyc 7262 Firmware romepi-sp3_1.0.0.d; AMD Epyc 7272 Firmware romepi-sp3_1.0.0.d; AMD Epyc 7282 Firmware romepi-sp3_1.0.0.d; AMD Epyc 72F3 Firmware milanpi-sp3_1.0.0.7; AMD Epyc 7302 Firmware romepi-sp3_1.0.0.d; AMD Epyc 7302P Firmware romepi-sp3_1.0.0.d; AMD Epyc 7313 Firmware milanpi-sp3_1.0.0.7; AMD Epyc 7313P Firmware milanpi-sp3_1.0.0.7; AMD Epyc 7343 Firmware milanpi-sp3_1.0.0.7. Check the vendor advisory for mitigations.

References

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