{"id":"CVE-2021-34503","aliases":["EUVD-2021-21157","GHSA-8x3j-fggj-hxrf"],"status":"published","title":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability","description":"Microsoft Windows Media Foundation 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":"2026-11-10","score":0.02305,"percentile":0.83487,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-07-14T17:54:21Z","modified":"2026-08-10T18:30:42Z","products":[{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34503","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34503","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34503"},{"url":"https://github.com/advisories/GHSA-8x3j-fggj-hxrf"}],"sources":{"cve":[{"id":"CVE-2021-34503","title":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability","description":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T17:54:21Z","modified":"2026-08-10T15:11:49.402Z","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":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21157","description":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T17:54:21Z","modified":"2026-08-10T15:11:49Z","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":"2026-11-02T18:02:03.704262Z"}],"ghsa":[{"id":"GHSA-8x3j-fggj-hxrf","title":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability This CVE ID is unique from...","description":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-34439, CVE-2021-34441.","status":"published","published":"2022-05-24T19:07:50Z","modified":"2026-08-10T18:30:42Z","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-2021-34503","description":"Microsoft Windows Media Foundation Remote Code Execution Vulnerability","status":"published","published":"2021-07-14T18:15:11.767Z","modified":"2026-08-10T16:17:53.94Z","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"}]}}