{"id":"CVE-2021-34534","aliases":["EUVD-2021-21187","GHSA-q37m-22jj-3f7x"],"status":"published","title":"Windows MSHTML Platform Remote Code Execution Vulnerability","description":"Windows MSHTML Platform Remote Code Execution Vulnerability","severity":{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02243,"percentile":0.82998,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-08-12T18:12:08Z","modified":"2026-08-10T18:31:59Z","products":[{"vendor":"microsoft","product":"windows 10 version 1507"},{"vendor":"microsoft","product":"windows 10 version 1607"},{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 1909"},{"vendor":"microsoft","product":"windows 10 version 2004"},{"vendor":"microsoft","product":"windows 10 version 20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows_10"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34534","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34534","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34534"},{"url":"https://github.com/advisories/GHSA-q37m-22jj-3f7x"}],"sources":{"cve":[{"id":"CVE-2021-34534","title":"Windows MSHTML Platform Remote Code Execution Vulnerability","description":"Windows MSHTML Platform Remote Code Execution Vulnerability","status":"published","published":"2021-08-12T18:12:08Z","modified":"2026-08-10T15:09:56.184Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:11.59359Z"}],"euvd":[{"id":"EUVD-2021-21187","description":"Windows MSHTML Platform Remote Code Execution Vulnerability","status":"published","published":"2021-08-12T18:12:08Z","modified":"2026-08-10T15:09:56Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:02:05.388264Z"}],"ghsa":[{"id":"GHSA-q37m-22jj-3f7x","title":"Windows MSHTML Platform Remote Code Execution Vulnerability","description":"Windows MSHTML Platform Remote Code Execution Vulnerability","status":"published","published":"2022-05-24T19:10:52Z","modified":"2026-08-10T18:31:59Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:10:15.270288Z"}],"nvd":[{"id":"CVE-2021-34534","description":"Windows MSHTML Platform Remote Code Execution Vulnerability","status":"published","published":"2021-08-12T18:15:09.407Z","modified":"2026-08-10T16:17:58.36Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5.1,"vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:56.943671Z"}]}}