{"id":"CVE-2024-21977","aliases":["EUVD-2024-19583","GHSA-hw87-hg67-xw42"],"status":"published","title":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade...","description":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.","severity":{"version":"3.1","score":3.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00156,"percentile":0.0483,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-459"],"published":"2025-09-05T12:58:39Z","modified":"2026-11-09T10:10:00Z","products":[{"vendor":"amd","product":"amd epyc™ 7003 series processors"},{"vendor":"amd","product":"amd epyc™ 8004 series processors"},{"vendor":"amd","product":"amd epyc™ 9004 series processors"},{"vendor":"amd","product":"amd epyc™ embedded 7003 series processors"},{"vendor":"amd","product":"amd epyc™ embedded 9004 series processors"},{"vendor":"amd","product":"amd ryzen™ 5000 series desktop processors"},{"vendor":"amd","product":"amd ryzen™ 5000 series mobile processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 6000 series processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 7000 series desktop processors"},{"vendor":"amd","product":"amd ryzen™ 7030 series mobile processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 7035 series processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 7040 series mobile processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 7045 series mobile processors with radeon™ graphics"},{"vendor":"amd","product":"amd ryzen™ 8000 series desktop processors"},{"vendor":"amd","product":"amd ryzen™ embedded 5000 series processors"},{"vendor":"amd","product":"amd ryzen™ embedded 7000 series processors"},{"vendor":"amd","product":"amd ryzen™ embedded 8000 series processors"},{"vendor":"amd","product":"amd ryzen™ embedded v3000 series processors"},{"vendor":"amd","product":"amd ryzen™ threadripper™ pro 3000 wx-series processors"},{"vendor":"amd","product":"amd ryzen™ threadripper™ pro 5000 wx-series processors"}],"references":[{"url":"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-4012.html"},{"url":"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-5007.html"},{"url":"https://www.amd.com/en/resources/product-security/bulletin/AMD-SB-3014.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21977"},{"url":"https://github.com/advisories/GHSA-hw87-hg67-xw42"}],"sources":{"cve":[{"id":"CVE-2024-21977","description":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.","status":"published","published":"2025-09-05T12:58:39.312Z","modified":"2025-09-05T13:35:08.152Z","cvss":[{"version":"3.1","score":3.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-459"],"updated_at":"2026-11-02T14:34:05.077718Z"}],"euvd":[{"id":"EUVD-2024-19583","description":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.","status":"published","published":"2025-09-05T12:58:39Z","modified":"2025-09-05T13:35:08Z","cvss":[{"version":"3.1","score":3.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T20:31:46.9428Z"}],"ghsa":[{"id":"GHSA-hw87-hg67-xw42","title":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade...","description":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.","status":"published","published":"2025-09-05T15:31:07Z","modified":"2025-09-05T15:31:16Z","cvss":[{"version":"3.1","score":3.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-459"],"updated_at":"2026-11-02T15:03:29.995439Z"}],"nvd":[{"id":"CVE-2024-21977","description":"Incomplete cleanup after loading a CPU microcode patch may allow a privileged attacker to degrade the entropy of the RDRAND instruction, potentially resulting in loss of integrity for SEV-SNP guests.","status":"published","published":"2025-09-05T13:15:31.31Z","modified":"2026-11-09T10:10:00.217Z","cvss":[{"version":"3.1","score":3.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-459"],"updated_at":"2026-11-09T12:13:53.420952Z"}]}}