{"id":"CVE-2021-33777","aliases":["EUVD-2021-20454","GHSA-6vfg-grh2-77vv"],"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":"2026-11-12","score":0.02361,"percentile":0.84014,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-07-14T17:53:49Z","modified":"2026-08-10T18:30:36Z","products":[{"vendor":"microsoft","product":"hevc video extensions"},{"vendor":"microsoft","product":"hevc_video_extensions"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33777","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33777","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33777"},{"url":"https://github.com/advisories/GHSA-6vfg-grh2-77vv"}],"sources":{"cve":[{"id":"CVE-2021-33777","title":"HEVC Video Extensions Remote Code Execution Vulnerability","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T17:53:49Z","modified":"2026-08-10T15:11:39.438Z","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":"2026-11-02T14:33:10.555814Z"}],"euvd":[{"id":"EUVD-2021-20454","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T17:53:49Z","modified":"2026-08-10T15:11:39Z","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":"2026-11-02T18:02:04.178454Z"}],"ghsa":[{"id":"GHSA-6vfg-grh2-77vv","title":"HEVC Video Extensions Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021...","description":"HEVC Video Extensions Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-31947, CVE-2021-33775, CVE-2021-33776, CVE-2021-33778.","status":"published","published":"2022-05-24T19:07:53Z","modified":"2026-08-10T18:30:36Z","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":"2026-11-02T15:10:14.126548Z"}],"nvd":[{"id":"CVE-2021-33777","description":"HEVC Video Extensions Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T18:15:10.687Z","modified":"2026-08-10T16:17:41.69Z","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":"2026-11-02T14:06:55.747384Z"}]}}