{
  "cveId": "CVE-2020-16899",
  "url": "https://patchblox.com/security/cve/CVE-2020-16899",
  "summary": "CVE-2020-16899 is fixed in 23 products on 1 platform, first by KB4580328, released October 13, 2020. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.",
  "title": "Windows TCP/IP Denial of Service Vulnerability",
  "description": "\u003Cp\u003EA 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.\u003C/p\u003E\n\u003Cp\u003ETo 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.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerability by correcting how the Windows TCP/IP stack handles ICMPv6 Router Advertisement packets.\u003C/p\u003E",
  "published": "2020-10-13T07:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "epss": 0.13454,
  "epssPercentile": 0.96457,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation More Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16899",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for 32-bit Systems",
      "fixedVersion": "16299.2166",
      "fix": "KB4580328",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580328",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for ARM64-based Systems",
      "fixedVersion": "16299.2166",
      "fix": "KB4580328",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580328",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for x64-based Systems",
      "fixedVersion": "16299.2166",
      "fix": "KB4580328",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580328",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for 32-bit Systems",
      "fixedVersion": "17134.1792",
      "fix": "KB4580330",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580330",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for ARM64-based Systems",
      "fixedVersion": "17134.1792",
      "fix": "KB4580330",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580330",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1803 for x64-based Systems",
      "fixedVersion": "17134.1792",
      "fix": "KB4580330",
      "url": "https://patchblox.com/security/fix/microsoft/kb4580330",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "17763.1518",
      "fix": "KB4577668",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577668",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for ARM64-based Systems",
      "fixedVersion": "17763.1518",
      "fix": "KB4577668",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577668",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "17763.1518",
      "fix": "KB4577668",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577668",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1903 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for 32-bit Systems",
      "fixedVersion": "19041.572",
      "fix": "KB4579311",
      "url": "https://patchblox.com/security/fix/microsoft/kb4579311",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for ARM64-based Systems",
      "fixedVersion": "19041.572",
      "fix": "KB4579311",
      "url": "https://patchblox.com/security/fix/microsoft/kb4579311",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for x64-based Systems",
      "fixedVersion": "19041.572",
      "fix": "KB4579311",
      "url": "https://patchblox.com/security/fix/microsoft/kb4579311",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019",
      "fixedVersion": "17763.1518",
      "fix": "KB4577668",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577668",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019 (Server Core installation)",
      "fixedVersion": "17763.1518",
      "fix": "KB4577668",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577668",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1903 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1909 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4577671",
      "url": "https://patchblox.com/security/fix/microsoft/kb4577671",
      "released": "2020-10-13T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 2004 (Server Core installation)",
      "fixedVersion": "19041.572",
      "fix": "KB4579311",
      "url": "https://patchblox.com/security/fix/microsoft/kb4579311",
      "released": "2020-10-13T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}