What’s Vulnerable › Vulnerabilities

CVE-2021-26403

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% 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-345

Description

Insufficient checks in SEV may lead to a malicious hypervisor disclosing the launch secret potentially resulting in compromise of VM confidentiality.

Affected products

• AMD Epyc 7001 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7002 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7232P Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7251 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7252 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7261 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7262 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7272 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7281 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7282 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7301 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7302 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7302P Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7351 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7351P Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7352 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7371 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7401 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7401P Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7402 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7402P Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7451 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7452 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7501 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7502 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7502P Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7532 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7542 Firmware: before romepi_1.0.0.9 — fixed in romepi_1.0.0.9
• AMD Epyc 7551 Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e
• AMD Epyc 7551P Firmware: before naplespi_1.0.0.e — fixed in naplespi_1.0.0.e

How to fix

Upgrade to a fixed version: AMD Epyc 7001 Firmware naplespi_1.0.0.e; AMD Epyc 7002 Firmware romepi_1.0.0.9; AMD Epyc 7232P Firmware romepi_1.0.0.9; AMD Epyc 7251 Firmware naplespi_1.0.0.e; AMD Epyc 7252 Firmware romepi_1.0.0.9; AMD Epyc 7261 Firmware naplespi_1.0.0.e; AMD Epyc 7262 Firmware romepi_1.0.0.9; AMD Epyc 7272 Firmware romepi_1.0.0.9; AMD Epyc 7281 Firmware naplespi_1.0.0.e; AMD Epyc 7282 Firmware romepi_1.0.0.9; AMD Epyc 7301 Firmware naplespi_1.0.0.e; AMD Epyc 7302 Firmware romepi_1.0.0.9. Check the vendor advisory for mitigations.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

Get alerted when CVE-2021-26403 or the next vulnerability affects your stack