{"id":"CVE-2021-26320","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-26320","generatedAt":"2026-10-27T22:32:09.696Z","title":"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","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","published":"2021-11-16T19:15:08.000Z","lastModified":"2026-06-17T03:43:07.000Z","status":"Modified","sourceIdentifier":"psirt@amd.com","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["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","amd/epyc 7662 firmware","amd/epyc 7642 firmware","amd/epyc 7552 firmware","amd/epyc 7542 firmware","amd/epyc 7532 firmware","amd/epyc 7502 firmware","amd/epyc 7502p firmware","amd/epyc 7452 firmware","amd/epyc 7402 firmware","amd/epyc 7402p firmware","amd/epyc 7352 firmware","amd/epyc 7302 firmware","amd/epyc 7302p firmware","amd/epyc 7282 firmware","amd/epyc 7272 firmware","amd/epyc 7262 firmware","amd/epyc 7252 firmware","amd/epyc 7232p firmware","amd/epyc 7763 firmware","amd/epyc 7713p firmware","amd/epyc 7713 firmware","amd/epyc 7663 firmware","amd/epyc 7643 firmware","amd/epyc 75f3 firmware","amd/epyc 7543p firmware","amd/epyc 7543 firmware","amd/epyc 7513 firmware","amd/epyc 7453 firmware","amd/epyc 74f3 firmware","amd/epyc 7443p firmware","amd/epyc 7443 firmware","amd/epyc 7413 firmware","amd/epyc 73f3 firmware","amd/epyc 7343 firmware","amd/epyc 7313p firmware","amd/epyc 7313 firmware","amd/epyc 72f3 firmware"],"epss":{"score":0.00186,"percentile":0.08161,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021","tags":["Vendor Advisory"],"source":"psirt@amd.com"},{"url":"https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-26320","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}