{
  "cveId": "CVE-2020-1066",
  "url": "https://patchblox.com/security/cve/CVE-2020-1066",
  "summary": "CVE-2020-1066 is fixed in 6 products on 1 platform, first by KB4556406, released May 14, 2020. It is not reported as exploited. Patch Radar priority: High.",
  "title": ".NET Framework Elevation of Privilege Vulnerability",
  "description": "\u003Cp\u003EAn elevation of privilege vulnerability exists in .NET Framework which could allow an attacker to elevate their privilege level.\u003C/p\u003E\n\u003Cp\u003ETo exploit the vulnerability, an attacker would first have to access the local machine, and then run a malicious program.\u003C/p\u003E\n\u003Cp\u003EThe update addresses the vulnerability by correcting how .NET Framework activates COM objects.\u003C/p\u003E",
  "published": "2020-05-14T07:00:00Z",
  "severity": "Important",
  "epss": 0.02522,
  "epssPercentile": 0.8495,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1066",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556406",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556406",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556402",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556402",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556406",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556406",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB4556402",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556402",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556403",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556403",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556399",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556399",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556403",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556403",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556399",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556399",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556403",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556403",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB4556399",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556399",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556403",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556403",
      "released": "2020-05-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB4556399",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556399",
      "released": "2020-05-14T07:00:00Z"
    }
  ],
  "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"
  }
}