CVE-2021-26320
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
Does this matter?
Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.
Description
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
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.19% probability · 8th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- amd/epyc 7601 firmware · amd/epyc 7551p firmware · amd/epyc 7551 firmware · amd/epyc 7501 firmware · amd/epyc 7451 firmware · amd/epyc 7401 firmware · amd/epyc 7371 firmware · amd/epyc 7351p firmware · amd/epyc 7351 firmware · amd/epyc 7301 firmware · amd/epyc 7281 firmware · amd/epyc 7261 firmware · amd/epyc 7251 firmware · amd/epyc 7f72 firmware · amd/epyc 7f52 firmware · amd/epyc 7f32 firmware · amd/epyc 7h12 firmware · amd/epyc 7742 firmware · amd/epyc 7702 firmware · amd/epyc 7702p firmware · +37 more
- Source
- psirt@amd.com
EPSS 0.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.