{"id":"CVE-2021-34444","aliases":["EUVD-2021-21099","GHSA-7879-3mvp-m36v"],"status":"published","title":"Windows DNS Server Denial of Service Vulnerability","description":"Windows DNS Server Denial of Service Vulnerability","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.03457,"percentile":0.89135,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2021-07-16T20:19:35Z","modified":"2026-08-10T18:30:47Z","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_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-2021-34444","tags":["vendor-advisory","patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34444","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34444"},{"url":"https://github.com/advisories/GHSA-7879-3mvp-m36v"}],"sources":{"cve":[{"id":"CVE-2021-34444","title":"Windows DNS Server Denial of Service Vulnerability","description":"Windows DNS Server Denial of Service Vulnerability","status":"published","published":"2021-07-16T20:19:35Z","modified":"2026-08-10T15:11:08.45Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21099","description":"Windows DNS Server Denial of Service Vulnerability","status":"published","published":"2021-07-16T20:19:35Z","modified":"2026-08-10T15:11:08Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-02T18:02:04.543433Z"}],"ghsa":[{"id":"GHSA-7879-3mvp-m36v","title":"Windows DNS Server Denial of Service Vulnerability This CVE ID is unique from CVE-2021-33745, CVE...","description":"Windows DNS Server Denial of Service Vulnerability This CVE ID is unique from CVE-2021-33745, CVE-2021-34442, CVE-2021-34499.","status":"published","published":"2022-05-24T19:08:16Z","modified":"2026-08-10T18:30:47Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:10:14.704025Z"}],"nvd":[{"id":"CVE-2021-34444","description":"Windows DNS Server Denial of Service Vulnerability","status":"published","published":"2021-07-16T21:15:09.447Z","modified":"2026-08-10T16:17:44.707Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:55.747384Z"}]}}