{"id":"CVE-2021-38661","aliases":["EUVD-2021-25100","GHSA-mcj5-4xrx-fgf3"],"status":"published","title":"HEVC Video Extensions Remote Code Execution Vulnerability","description":"HEVC Video Extensions Remote Code Execution Vulnerability","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.02294,"percentile":0.83485,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-09-15T11:24:21Z","modified":"2026-08-10T18:32:16Z","products":[{"vendor":"microsoft","product":"hevc video extensions"},{"vendor":"microsoft","product":"hevc_video_extensions"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38661","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38661","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38661"},{"url":"https://github.com/advisories/GHSA-mcj5-4xrx-fgf3"}],"sources":{"cve":[{"id":"CVE-2021-38661","title":"HEVC Video Extensions Remote Code Execution Vulnerability","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-09-15T11:24:21Z","modified":"2026-08-10T15:11:07.572Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:07.349244Z"}],"euvd":[{"id":"EUVD-2021-25100","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-09-15T11:24:21Z","modified":"2026-08-10T15:11:07Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T18:02:04.543433Z"}],"ghsa":[{"id":"GHSA-mcj5-4xrx-fgf3","title":"HEVC Video Extensions Remote Code Execution Vulnerability","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2022-05-24T19:14:41Z","modified":"2026-08-10T18:32:16Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:10:15.841734Z"}],"nvd":[{"id":"CVE-2021-38661","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-09-15T12:15:15.893Z","modified":"2026-08-10T16:18:12.097Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:58.502206Z"}]}}