{"id":"CVE-2021-26877","aliases":["EUVD-2021-13661","GHSA-86v8-8qp7-vj9r"],"status":"published","title":"Windows DNS Server Remote Code Execution Vulnerability","description":"Windows DNS Server Remote Code Execution Vulnerability","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.17285,"percentile":0.97143,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-94"],"published":"2021-03-11T15:40:08Z","modified":"2026-08-19T18:32:32Z","products":[{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)"},{"vendor":"microsoft","product":"windows server 2008 service pack 2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows server 2012 r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows server 2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows server version 2004"},{"vendor":"microsoft","product":"windows server version 20h2"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_server_2012"},{"vendor":"microsoft","product":"windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26877","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26877","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26877"},{"url":"https://github.com/advisories/GHSA-86v8-8qp7-vj9r"}],"sources":{"cve":[{"id":"CVE-2021-26877","title":"Windows DNS Server Remote Code Execution Vulnerability","description":"Windows DNS Server Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T15:40:08Z","modified":"2026-08-19T16:30:26.912Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical","assessor":"cna"}],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13661","description":"Windows DNS Server Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T15:40:08Z","modified":"2026-08-19T16:30:26Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"critical"}],"updated_at":"2026-11-02T18:01:42.811156Z"}],"ghsa":[{"id":"GHSA-86v8-8qp7-vj9r","title":"Windows DNS Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26893,...","description":"Windows DNS Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26893, CVE-2021-26894, CVE-2021-26895, CVE-2021-26897.","status":"published","published":"2022-05-24T17:44:20Z","modified":"2026-08-19T18:32:32Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:10:42.300371Z"}],"nvd":[{"id":"CVE-2021-26877","description":"Windows DNS Server Remote Code Execution Vulnerability","status":"published","published":"2021-03-11T16:15:15.19Z","modified":"2026-08-19T17:17:43.04Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:06:50.805771Z"}]}}