{"id":"CVE-2021-26402","aliases":["EUVD-2021-13208","GHSA-f358-f8cc-67vr"],"status":"published","title":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox...","description":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00185,"percentile":0.0818,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2023-01-10T20:56:41Z","modified":"2026-06-17T03:43:20Z","products":[{"vendor":"amd","product":"2nd gen epyc"},{"vendor":"amd","product":"3rd gen 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Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26402"},{"url":"https://github.com/advisories/GHSA-f358-f8cc-67vr"}],"sources":{"cve":[{"id":"CVE-2021-26402","description":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.\n\n","status":"published","published":"2023-01-10T20:56:41.784Z","modified":"2025-04-08T20:27:13.237Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13208","description":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.\n\n","status":"published","published":"2023-01-10T20:56:41Z","modified":"2025-04-08T20:27:13Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T20:52:39.117101Z"}],"ghsa":[{"id":"GHSA-f358-f8cc-67vr","title":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox...","description":"Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and 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availability.\n\n","status":"published","published":"2023-01-11T08:15:11.537Z","modified":"2026-06-17T03:43:20.01Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:07.323379Z"}]}}