{"id":"CVE-2021-46755","aliases":["EUVD-2021-33411","GHSA-xpf2-4v7h-fpcm"],"status":"published","title":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor)...","description":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor) bootloader may allow an attacker\nwith a malicious bootloader to exhaust the SysHub resources resulting in a\npotential denial of service.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00616,"percentile":0.49861,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2023-05-09T19:00:26Z","modified":"2026-06-17T04:15:27Z","products":[{"vendor":"amd","product":"3rd gen amd ryzen™ threadripper™ processors “castle peak” hedt"},{"vendor":"amd","product":"amd ryzen™ 5000 series desktop processors “vermeer” am4"},{"vendor":"amd","product":"ryzen_3100_firmware"},{"vendor":"amd","product":"ryzen_3300x_firmware"},{"vendor":"amd","product":"ryzen_3500_firmware"},{"vendor":"amd","product":"ryzen_3500x_firmware"},{"vendor":"amd","product":"ryzen_3600_firmware"},{"vendor":"amd","product":"ryzen_3600x_firmware"},{"vendor":"amd","product":"ryzen_3600xt_firmware"},{"vendor":"amd","product":"ryzen_3800x_firmware"},{"vendor":"amd","product":"ryzen_3800xt_firmware"},{"vendor":"amd","product":"ryzen_3900_firmware"},{"vendor":"amd","product":"ryzen_3900x_firmware"},{"vendor":"amd","product":"ryzen_3900xt_firmware"},{"vendor":"amd","product":"ryzen_3950x_firmware"},{"vendor":"amd","product":"ryzen_5500_firmware"},{"vendor":"amd","product":"ryzen_5600_firmware"},{"vendor":"amd","product":"ryzen_5600g_firmware"},{"vendor":"amd","product":"ryzen_5600x_firmware"},{"vendor":"amd","product":"ryzen_5700g_firmware"},{"vendor":"amd","product":"ryzen_5700x_firmware"},{"vendor":"amd","product":"ryzen_5800x3d_firmware"},{"vendor":"amd","product":"ryzen_5800x_firmware"},{"vendor":"amd","product":"ryzen_5900x_firmware"},{"vendor":"amd","product":"ryzen_5950x_firmware"},{"vendor":"amd","product":"ryzen™ 3000 series desktop processors “matisse” am4"},{"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"},{"vendor":"amd","product":"ryzen™ threadripper™ pro processors “chagall” ws"}],"references":[{"url":"https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-46755"},{"url":"https://github.com/advisories/GHSA-xpf2-4v7h-fpcm"}],"sources":{"cve":[{"id":"CVE-2021-46755","description":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor) bootloader may allow an attacker\nwith a malicious bootloader to exhaust the SysHub resources resulting in a\npotential denial of service.\n\n\n\n\n","status":"published","published":"2023-05-09T19:00:26.747Z","modified":"2025-01-28T15:39:32.696Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"updated_at":"2026-11-02T14:33:03.320536Z"}],"euvd":[{"id":"EUVD-2021-33411","description":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor) bootloader may allow an attacker\nwith a malicious bootloader to exhaust the SysHub resources resulting in a\npotential denial of service.\n\n\n\n\n","status":"published","published":"2023-05-09T19:00:26Z","modified":"2025-01-28T15:39:32Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:11.814906Z"}],"ghsa":[{"id":"GHSA-xpf2-4v7h-fpcm","title":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor)...","description":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor) bootloader may allow an attacker\nwith a malicious bootloader to exhaust the SysHub resources resulting in a\npotential denial of service.\n\n\n\n\n","status":"published","published":"2023-05-09T21:30:23Z","modified":"2024-04-04T03:57:45Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T14:56:20.113325Z"}],"nvd":[{"id":"CVE-2021-46755","description":"Failure to unmap certain SysHub mappings in\nerror paths of the ASP (AMD Secure Processor) bootloader may allow an attacker\nwith a malicious bootloader to exhaust the SysHub resources resulting in a\npotential denial of service.\n\n\n\n\n","status":"published","published":"2023-05-09T20:15:12.157Z","modified":"2026-06-17T04:15:27.24Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"updated_at":"2026-11-02T14:07:07.764332Z"}]}}