{
  "cveId": "CVE-2018-0956",
  "url": "https://patchblox.com/security/cve/CVE-2018-0956",
  "summary": "CVE-2018-0956 is fixed in 13 products on 1 platform, first by KB4093109, released April 10, 2018. It is not reported as exploited. Patch Radar priority: High.",
  "title": "HTTP/2 Server Denial of Service Vulnerability",
  "description": "\u003Cp\u003EA denial of service vulnerability exists in the HTTP/2 protocol stack (HTTP.sys) when HTTP.sys improperly parses specially crafted HTTP/2 requests. An attacker who successfully exploited the vulnerability could create a denial of service condition, causing the target system to become unresponsive.\u003C/p\u003E\n\u003Cp\u003ETo exploit this vulnerability, an unauthenticated attacker could send a specially crafted HTTP packet to a target system, causing the affected system to become nonresponsive.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerability by modifying how the Windows HTTP protocol stack handles HTTP/2 requests. Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate user rights.\u003C/p\u003E",
  "published": "2018-04-10T07:00:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "epss": 0.13693,
  "epssPercentile": 0.96515,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Unlikely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-0956",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1511 for 32-bit Systems",
      "fixedVersion": "10586.1540",
      "fix": "KB4093109",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093109",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1511 for x64-based Systems",
      "fixedVersion": "10586.1540",
      "fix": "KB4093109",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093109",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.2189",
      "fix": "KB4093119",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093119",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.2189",
      "fix": "KB4093119",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093119",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1703 for 32-bit Systems",
      "fixedVersion": "15063.1029",
      "fix": "KB4093107",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093107",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1703 for x64-based Systems",
      "fixedVersion": "15063.1029",
      "fix": "KB4093107",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093107",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for 32-bit Systems",
      "fixedVersion": "16299.371",
      "fix": "KB4093112",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093112",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1709 for x64-based Systems",
      "fixedVersion": "16299.371",
      "fix": "KB4093112",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093112",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for 32-bit Systems",
      "fixedVersion": "10240.17831",
      "fix": "KB4093111",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093111",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for x64-based Systems",
      "fixedVersion": "10240.17831",
      "fix": "KB4093111",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093111",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.2189",
      "fix": "KB4093119",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093119",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016 (Server Core installation)",
      "fixedVersion": "14393.2189",
      "fix": "KB4093119",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093119",
      "released": "2018-04-10T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server, version 1709  (Server Core Installation)",
      "fixedVersion": "16299.371",
      "fix": "KB4093112",
      "url": "https://patchblox.com/security/fix/microsoft/kb4093112",
      "released": "2018-04-10T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}