medium
5.5
CWE
295
Advisory Published
Updated

CVE-2021-26320

First published: Tue Nov 09 2021(Updated: )

Insufficient validation of the AMD SEV Signing Key (ASK) in the SEND_START command in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP

Credit: psirt@amd.com

Affected SoftwareAffected VersionHow to fix
AMD EPYC 7601 Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7601 Firmware
AMD EPYC 7551P Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7551P Firmware
AMD EPYC 7551P Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7551 Firmware
AMD EPYC 7501 firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7501
AMD EPYC 7451 Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7451 Firmware
AMD EPYC 7401P Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7401 Firmware
AMD EPYC 7371 Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7371 Firmware
AMD EPYC 7351P Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7351P Firmware
AMD EPYC 7351P Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7351 Firmware
Amd Epyc Server Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7301 Firmware
Amd Epyc Server Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7281 Firmware
AMD EPYC 7261 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7261
AMD EPYC 7251 Firmware<naplespi-sp3_1.0.0.g
AMD EPYC 7251 Firmware
AMD EPYC 7F72<romepi-sp3_1.0.0.c
AMD EPYC 7F72 Firmware
AMD EPYC 7F52 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7F52 Firmware
AMD EPYC 7F32 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7F32 Firmware
AMD EPYC 7H12 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7H12 Firmware
AMD EPYC 7742 firmware<romepi-sp3_1.0.0.c
AMD EPYC 7742 firmware
AMD EPYC 7702 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7702
AMD EPYC 7702 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7702p
AMD EPYC 7662 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7662 Firmware
AMD EPYC 7642 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7642 Firmware
AMD EPYC 7552 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7552 Firmware
AMD EPYC 7542 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7542
AMD EPYC 7532 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7532 Firmware
AMD EPYC 7502P Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7502 firmware
AMD EPYC 7502P Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7502P Firmware
AMD EPYC 7452 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7452
Amd Epyc Server Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7402 Firmware
AMD EPYC 7402P Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7402P Firmware
AMD EPYC 7352 firmware<romepi-sp3_1.0.0.c
AMD EPYC 7352 firmware
Amd Epyc Server Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7302 Firmware
AMD EPYC 7302P Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7302P Firmware
AMD EPYC 7282 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7282 Firmware
AMD EPYC 7272 firmware<romepi-sp3_1.0.0.c
AMD EPYC 7272 firmware
AMD EPYC 7262 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7262 Firmware
AMD EPYC 7252 Firmware<romepi-sp3_1.0.0.c
AMD EPYC 7252 Firmware
AMD EPYC 7232p firmware<romepi-sp3_1.0.0.c
AMD EPYC 7232p firmware
AMD EPYC 7763 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7763 Firmware
AMD EPYC 7713P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7713P Firmware
AMD EPYC 7713P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7713 Firmware
AMD EPYC 7663 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7663 Firmware
AMD EPYC 7643P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7643 Firmware
AMD EPYC 75F3 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 75F3 Firmware
AMD EPYC 7543P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7543P Firmware
Amd Epyc Server Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7543 Firmware
AMD EPYC 7513 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7513 Firmware
Amd Epyc Server Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7453
AMD EPYC 74F3 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 74F3 Firmware
AMD EPYC 7443P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7443P Firmware
AMD EPYC 7443P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7443P
AMD EPYC 7413 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7413 Firmware
AMD EPYC 73F3 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 73F3 Firmware
Amd Epyc Server Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7343 Firmware
AMD EPYC 7313P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7313P Firmware
AMD EPYC 7313P Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 7313 Firmware
AMD EPYC 72F3 Firmware<milanpi-sp3_1.0.0.4
AMD EPYC 72F3 Firmware

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-26320?

    CVE-2021-26320 has a medium severity rating due to insufficient validation of the AMD SEV Signing Key which could lead to a denial of service.

  • How do I fix CVE-2021-26320?

    To fix CVE-2021-26320, update the affected AMD Epyc firmware to the latest version available from the manufacturer.

  • Which AMD Epyc firmware versions are affected by CVE-2021-26320?

    CVE-2021-26320 affects multiple versions of the AMD Epyc firmware prior to the patch marked in the security bulletin from AMD.

  • What could be the impact of CVE-2021-26320 if exploited?

    If exploited, CVE-2021-26320 could allow local authenticated attackers to cause a denial of service affecting the Platform Security Processor (PSP).

  • Is there a workaround for CVE-2021-26320 while waiting for a patch?

    Currently, the best approach for CVE-2021-26320 is to apply the firmware update, as there are no known workarounds that effectively mitigate the risk.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203