A denial of service vulnerability exists when the Windows TCP/IP stack improperly handles ICMPv6 Router Advertisement packets. An attacker who successfully exploited this vulnerability could cause a target system to stop responding.
\nTo exploit this vulnerability, an attacker would have to send specially crafted ICMPv6 Router Advertisement packets to a remote Windows computer. The vulnerability would not allow an attacker to execute code or to elevate user rights directly.
\nThe update addresses the vulnerability by correcting how the Windows TCP/IP stack handles ICMPv6 Router Advertisement packets.
","dates":{"published":"2020-10-16T22:17:41.000Z","modified":"2024-08-04T13:45:34.590Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.8,"severity":"high","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.13454,"percentile":0.96403,"severity":"medium","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.13454},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.13454,"percentile":0.96403}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.13454,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.13454,"percentile":0.96403}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"microsoft","product":"windows_10","name":"windows 10","label":"windows_10","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"1709","noFixRecorded":false,"fixedIn":null},{"text":"1803","noFixRecorded":false,"fixedIn":null},{"text":"1809","noFixRecorded":false,"fixedIn":null},{"text":"1903","noFixRecorded":false,"fixedIn":null},{"text":"1909","noFixRecorded":false,"fixedIn":null},{"text":"2004","noFixRecorded":false,"fixedIn":null}],"versionsText":"1709 | 1803 | 1809 | 1903 | 1909 | 2004","eol":null,"hubHref":"/vendor/microsoft/windows_10"},{"vendor":"microsoft","product":"windows 10 version 1709","name":"Windows 10 Version 1709","label":"windows 10 version 1709","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1709"},{"vendor":"microsoft","product":"windows 10 version 1709 for 32-bit systems","name":"Windows 10 Version 1709 for 32-bit Systems","label":"windows 10 version 1709 for 32-bit systems","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1709_for_32-bit_systems"},{"vendor":"microsoft","product":"windows 10 version 1803","name":"Windows 10 Version 1803","label":"windows 10 version 1803","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1803"},{"vendor":"microsoft","product":"windows 10 version 1809","name":"Windows 10 Version 1809","label":"windows 10 version 1809","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1809"},{"vendor":"microsoft","product":"windows 10 version 1903 for 32-bit systems","name":"Windows 10 Version 1903 for 32-bit Systems","label":"windows 10 version 1903 for 32-bit systems","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1903_for_32-bit_systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for arm64-based systems","name":"Windows 10 Version 1903 for ARM64-based Systems","label":"windows 10 version 1903 for arm64-based systems","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1903_for_arm64-based_systems"},{"vendor":"microsoft","product":"windows 10 version 1903 for x64-based systems","name":"Windows 10 Version 1903 for x64-based Systems","label":"windows 10 version 1903 for x64-based systems","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1903_for_x64-based_systems"},{"vendor":"microsoft","product":"windows 10 version 1909","name":"Windows 10 Version 1909","label":"windows 10 version 1909","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1909"},{"vendor":"microsoft","product":"windows 10 version 2004","name":"Windows 10 Version 2004","label":"windows 10 version 2004","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_2004"},{"vendor":"microsoft","product":"windows_server_2016","name":"windows server 2016","label":"windows_server_2016","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"1903","noFixRecorded":false,"fixedIn":null},{"text":"1909","noFixRecorded":false,"fixedIn":null},{"text":"2004","noFixRecorded":false,"fixedIn":null}],"versionsText":"1903 | 1909 | 2004","eol":null,"hubHref":"/vendor/microsoft/windows_server_2016"},{"vendor":"microsoft","product":"windows_server_2019","name":"windows server 2019","label":"windows_server_2019","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication | na","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)","name":"Windows Server 2019 (Server Core installation)","label":"windows server 2019 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019_server_core_installation"},{"vendor":"microsoft","product":"windows server, version 1903 (server core installation)","name":"Windows Server, version 1903 (Server Core installation)","label":"windows server, version 1903 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_1903_server_core_installation"},{"vendor":"microsoft","product":"windows server, version 1909 (server core installation)","name":"Windows Server, version 1909 (Server Core installation)","label":"windows server, version 1909 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_1909_server_core_installation"},{"vendor":"microsoft","product":"windows server version 2004","name":"Windows Server version 2004","label":"windows server version 2004","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < publication","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < publication","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_2004"}],"affectedCount":16,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16899","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16899","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","Patch","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2020-10-16T22:17:41.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-04T13:45:34.590Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":34,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T10:10:47.459Z","stale":false,"partial":false}}