CVE-2021-26320: Medium severity AMD Epyc 7601 Firmware vulnerability
Published Nov 16, 2021
·Updated
Insufficient validation of the AMD SEV Signing Key (ASK) in the SENDSTART command in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP
Affected Software
114 affected components
AMD Epyc 7601 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7601
AMD Epyc 7551p Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7551p
AMD Epyc 7551 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7551
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
AMD Epyc 7401 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7401
AMD Epyc 7371 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7371
AMD Epyc 7351p Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7351p
AMD Epyc 7351 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7351
AMD Epyc 7301 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7301
AMD Epyc 7281 Firmware<naplespi-sp3_1.0.0.g
AMD Epyc 7281
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
AMD Epyc 7f72 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7f72
AMD Epyc 7f52 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7f52
AMD Epyc 7f32 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7f32
AMD Epyc 7h12 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7h12
AMD Epyc 7742 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7742
AMD Epyc 7702 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7702
AMD Epyc 7702p Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7702p
AMD Epyc 7662 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7662
AMD Epyc 7642 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7642
AMD Epyc 7552 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7552
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
AMD Epyc 7502 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7502
AMD Epyc 7502p Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7502p
AMD Epyc 7452 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7452
AMD Epyc 7402 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7402
AMD Epyc 7402p Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7402p
AMD Epyc 7352 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7352
AMD Epyc 7302 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7302
AMD Epyc 7302p Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7302p
AMD Epyc 7282 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7282
AMD Epyc 7272 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7272
AMD Epyc 7262 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7262
AMD Epyc 7252 Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7252
AMD Epyc 7232p Firmware<romepi-sp3_1.0.0.c
AMD Epyc 7232p
AMD Epyc 7763 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7763
AMD Epyc 7713p Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7713p
AMD Epyc 7713 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7713
AMD Epyc 7663 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7663
AMD Epyc 7643 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7643
AMD Epyc 75f3 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 75f3
AMD Epyc 7543p Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7543p
AMD Epyc 7543 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7543
AMD Epyc 7513 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7513
AMD Epyc 7453 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7453
AMD Epyc 74f3 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 74f3
AMD Epyc 7443p Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7443p
AMD Epyc 7443 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7443
AMD Epyc 7413 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7413
AMD Epyc 73f3 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 73f3
AMD Epyc 7343 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7343
AMD Epyc 7313p Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7313p
AMD Epyc 7313 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 7313
AMD Epyc 72f3 Firmware<milanpi-sp3_1.0.0.4
AMD Epyc 72f3
Event History
Nov 16, 2021
CVE Published
via MITRE·06:05 PM
Data Sourced
via MITRE·06:05 PM
DescriptionWeakness
Frequently Asked Questions
1
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.
2
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.
3
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.
4
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).
5
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.