{"id":"CVE-2021-46756","aliases":["EUVD-2021-33412","GHSA-p57x-q6x3-v235"],"status":"published","title":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor)...","description":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an\nattacker with a malicious Uapp or ABL to send malformed or invalid syscall to\nthe bootloader resulting in a potential denial of service and loss of\nintegrity.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00645,"percentile":0.51274,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2023-05-09T19:00:35Z","modified":"2026-06-17T04:15:27Z","products":[{"vendor":"amd","product":"1st gen amd epyc™ 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2000 series desktop processors “pinnacle ridge”"},{"vendor":"amd","product":"ryzen™ 2000 series desktop processors “raven ridge” am4"},{"vendor":"amd","product":"ryzen™ 2000 series mobile processors “raven ridge” fp5"},{"vendor":"amd","product":"ryzen™ 3000 series desktop processors “matisse” am4"},{"vendor":"amd","product":"ryzen™ 3000 series mobile processor, 2nd gen amd ryzen™ mobile processors with radeon™ graphics “picasso”"},{"vendor":"amd","product":"ryzen™ 3000 series mobile processors with radeon™ graphics “renoir”"},{"vendor":"amd","product":"ryzen™ 5000 series desktop processor with radeon™ graphics  “cezanne” am4"},{"vendor":"amd","product":"ryzen™ 5000 series mobile processors with radeon™ graphics “cezanne”"},{"vendor":"amd","product":"ryzen™ 5000 series mobile processors with radeon™ graphics “lucienne”"},{"vendor":"amd","product":"ryzen™ threadripper™ pro processors “castle peak” ws"}],"references":[{"url":"https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46756"},{"url":"https://github.com/advisories/GHSA-p57x-q6x3-v235"}],"sources":{"cve":[{"id":"CVE-2021-46756","description":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an\nattacker with a malicious Uapp or ABL to send malformed or invalid syscall to\nthe bootloader resulting in a potential denial of service and loss of\nintegrity.\n\n\n\n\n\n\n\n\n","status":"published","published":"2023-05-09T19:00:35.599Z","modified":"2025-01-28T15:38:19.211Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"adp"}],"updated_at":"2026-11-02T14:33:02.930115Z"}],"euvd":[{"id":"EUVD-2021-33412","description":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an\nattacker with a malicious Uapp or ABL to send malformed or invalid syscall to\nthe bootloader resulting in a potential denial of service and loss of\nintegrity.\n\n\n\n\n\n\n\n\n","status":"published","published":"2023-05-09T19:00:35Z","modified":"2025-01-28T15:38:19Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical"}],"updated_at":"2026-11-03T00:04:11.814906Z"}],"ghsa":[{"id":"GHSA-p57x-q6x3-v235","title":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor)...","description":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an\nattacker with a malicious Uapp or ABL to send malformed or invalid syscall to\nthe bootloader resulting in a potential denial of service and loss of\nintegrity.\n\n\n\n\n\n\n\n\n","status":"published","published":"2023-05-09T21:30:23Z","modified":"2024-04-04T03:57:43Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:56:20.113325Z"}],"nvd":[{"id":"CVE-2021-46756","description":"Insufficient validation of inputs in\nSVC_MAP_USER_STACK in the ASP (AMD Secure Processor) bootloader may allow an\nattacker with a malicious Uapp or ABL to send malformed or invalid syscall to\nthe bootloader resulting in a potential denial of service and loss of\nintegrity.\n\n\n\n\n\n\n\n\n","status":"published","published":"2023-05-09T20:15:12.2Z","modified":"2026-06-17T04:15:27.513Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"primary"},{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:07:07.764332Z"}]}}