{
  "fix": "KB4457044",
  "url": "https://patchblox.com/security/fix/microsoft/kb4457044",
  "summary": "KB4457044, released September 12, 2018, fixes 1 CVE across 5 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "September 2018 security update",
  "released": "2018-09-12T07:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2018-8421, rated Critical",
  "supported": false,
  "cveCount": 1,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.29075,
  "vendorAdvisory": "https://support.microsoft.com/help/4457044",
  "appliesTo": [
    {
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5.1-on-windows-7-for-32-bit-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5.1-on-windows-7-for-x64-based-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5.1-on-windows-server-2008-r2-for-itanium-based-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5.1-on-windows-server-2008-r2-for-x64-based-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5.1-on-windows-server-2008-r2-for-x64-based-systems-service-pack-1-server-core-installation",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2018-8421",
      "url": "https://patchblox.com/security/cve/CVE-2018-8421",
      "title": ".NET Framework Remote Code Execution Vulnerability",
      "component": ".NET Framework",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "epss": 0.29075,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}