What’s Vulnerable › Vulnerabilities

CVE-2021-26315

• Severity: high (CVSS 7.8 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: 2021-11-16 · updated 2026-06-17
• Weakness: CWE-345

Description

When the AMD Platform Security Processor (PSP) boot rom loads, authenticates, and subsequently decrypts an encrypted FW, due to insufficient verification of the integrity of decrypted image, arbitrary code may be executed in the PSP when encrypted firmware images are used.

Affected products

• AMD Epyc 7003 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 72F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• 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 73F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• 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 7453 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 7513 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7543 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7543P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 75F3 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7643 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7663 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7713 Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7713P Firmware: before milanpi-sp3_1.0.0.4 — fixed in milanpi-sp3_1.0.0.4
• AMD Epyc 7763 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 7003 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 72F3 Firmware milanpi-sp3_1.0.0.4; 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; AMD Epyc 73F3 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7413 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7443 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7443P Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7453 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 74F3 Firmware milanpi-sp3_1.0.0.4; AMD Epyc 7513 Firmware milanpi-sp3_1.0.0.4. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021
• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021

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