CVE-2021-26343

Severity: medium (CVSS 5.5 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: 2023-01-11 · updated 2026-06-17
Weakness: CWE-668

Description

Insufficient validation in ASP BIOS and DRTM commands may allow malicious supervisor x86 software to disclose the contents of sensitive memory which may result in information disclosure.

Affected products

AMD Epyc 7003 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 72F3 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7313 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7313P Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7343 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7373X Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 73F3 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7413 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7443 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7443P Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7453 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 74F3 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7513 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7543 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7543P Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7573X Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 75F3 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7643 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7663 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7713 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7713P Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7743 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7763 Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3
AMD Epyc 7773X Firmware: before milanpi_1.0.0.3 — fixed in milanpi_1.0.0.3

How to fix

Upgrade to a fixed version: AMD Epyc 7003 Firmware milanpi_1.0.0.3; AMD Epyc 72F3 Firmware milanpi_1.0.0.3; AMD Epyc 7313 Firmware milanpi_1.0.0.3; AMD Epyc 7313P Firmware milanpi_1.0.0.3; AMD Epyc 7343 Firmware milanpi_1.0.0.3; AMD Epyc 7373X Firmware milanpi_1.0.0.3; AMD Epyc 73F3 Firmware milanpi_1.0.0.3; AMD Epyc 7413 Firmware milanpi_1.0.0.3; AMD Epyc 7443 Firmware milanpi_1.0.0.3; AMD Epyc 7443P Firmware milanpi_1.0.0.3; AMD Epyc 7453 Firmware milanpi_1.0.0.3; AMD Epyc 74F3 Firmware milanpi_1.0.0.3. Check the vendor advisory for mitigations.

References

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