{"id":"CVE-2020-0836","aliases":["EUVD-2020-2308","GHSA-pf2q-6q6p-25p9"],"status":"published","title":"Windows DNS Denial of Service Vulnerability","description":"\u003cp\u003eA denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.\u003c/p\u003e\n\u003cp\u003eTo exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.\u003c/p\u003e\n\u003cp\u003eThe update addresses the vulnerability by correcting how Windows DNS processes queries.\u003c/p\u003e","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.05051,"percentile":0.92361,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2020-09-11T17:08:23Z","modified":"2026-06-17T02:46:43Z","products":[{"vendor":"microsoft","product":"windows server 2008  service pack 2"},{"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 1903 (server core installation)"},{"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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0836","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-0836"},{"url":"https://github.com/advisories/GHSA-pf2q-6q6p-25p9"}],"sources":{"cve":[{"id":"CVE-2020-0836","title":"Windows DNS Denial of Service Vulnerability","description":"\u003cp\u003eA denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.\u003c/p\u003e\n\u003cp\u003eTo exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.\u003c/p\u003e\n\u003cp\u003eThe update addresses the vulnerability by correcting how Windows DNS processes queries.\u003c/p\u003e","status":"published","published":"2020-09-11T17:08:23Z","modified":"2024-08-04T06:18:03.282Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:35:59.763887Z"}],"euvd":[{"id":"EUVD-2020-2308","description":"\u003cp\u003eA denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.\u003c/p\u003e\n\u003cp\u003eTo exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.\u003c/p\u003e\n\u003cp\u003eThe update addresses the vulnerability by correcting how Windows DNS processes queries.\u003c/p\u003e","status":"published","published":"2020-09-11T17:08:23Z","modified":"2024-08-04T06:18:03Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-03T03:08:17.347367Z"}],"ghsa":[{"id":"GHSA-pf2q-6q6p-25p9","title":"A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries,...","description":"A denial of service vulnerability exists in Windows DNS when it fails to properly handle queries, aka 'Windows DNS Denial of Service Vulnerability'. This CVE ID is unique from CVE-2020-1228.","status":"published","published":"2022-05-24T17:27:54Z","modified":"2024-01-01T00:30:37Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:55:19.223338Z"}],"nvd":[{"id":"CVE-2020-0836","description":"\u003cp\u003eA denial of service vulnerability exists in Windows DNS when it fails to properly handle queries. An attacker who successfully exploited this vulnerability could cause the DNS service to become nonresponsive.\u003c/p\u003e\n\u003cp\u003eTo exploit the vulnerability, an authenticated attacker could send malicious DNS queries to a target, resulting in a denial of service.\u003c/p\u003e\n\u003cp\u003eThe update addresses the vulnerability by correcting how Windows DNS processes queries.\u003c/p\u003e","status":"published","published":"2020-09-11T17:15:13.947Z","modified":"2026-06-17T02:46:43.743Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:06:14.981587Z"}]}}