{
  "product": "Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
  "url": "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",
  "summary": "Patch Radar has 53 security fixes for Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), closing 52 CVEs, 3 of which are being exploited. The newest security fix is KB5066739, released October 14, 2025. This product is no longer supported.",
  "platform": "microsoft",
  "vendor": "Microsoft",
  "supported": false,
  "fixCount": 53,
  "cveCount": 52,
  "exploitedCveCount": 3,
  "unfixedCveCount": 0,
  "fixes": [
    {
      "fix": "KB5066739",
      "url": "https://patchblox.com/security/fix/microsoft/kb5066739",
      "released": "2025-10-14T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5044085",
      "url": "https://patchblox.com/security/fix/microsoft/kb5044085",
      "released": "2024-10-23T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5044095",
      "url": "https://patchblox.com/security/fix/microsoft/kb5044095",
      "released": "2024-10-23T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5041021",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041021",
      "released": "2024-07-09T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5041026",
      "url": "https://patchblox.com/security/fix/microsoft/kb5041026",
      "released": "2024-07-09T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5034269",
      "url": "https://patchblox.com/security/fix/microsoft/kb5034269",
      "released": "2024-05-08T12:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 4,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB5034277",
      "url": "https://patchblox.com/security/fix/microsoft/kb5034277",
      "released": "2024-05-08T12:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 3,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB5030182",
      "url": "https://patchblox.com/security/fix/microsoft/kb5030182",
      "released": "2023-12-12T14:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 5,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5032185",
      "url": "https://patchblox.com/security/fix/microsoft/kb5032185",
      "released": "2023-11-14T14:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5032341",
      "url": "https://patchblox.com/security/fix/microsoft/kb5032341",
      "released": "2023-11-14T14:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5027531",
      "url": "https://patchblox.com/security/fix/microsoft/kb5027531",
      "released": "2023-06-13T12:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 6,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5027540",
      "url": "https://patchblox.com/security/fix/microsoft/kb5027540",
      "released": "2023-06-13T12:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 6,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5022731",
      "url": "https://patchblox.com/security/fix/microsoft/kb5022731",
      "released": "2023-02-14T14:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5022783",
      "url": "https://patchblox.com/security/fix/microsoft/kb5022783",
      "released": "2023-02-14T14:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5021079",
      "url": "https://patchblox.com/security/fix/microsoft/kb5021079",
      "released": "2022-12-13T14:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5021091",
      "url": "https://patchblox.com/security/fix/microsoft/kb5021091",
      "released": "2022-12-13T14:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5012324",
      "url": "https://patchblox.com/security/fix/microsoft/kb5012324",
      "released": "2022-04-19T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB5012329",
      "url": "https://patchblox.com/security/fix/microsoft/kb5012329",
      "released": "2022-04-19T12:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4556399",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556399",
      "released": "2020-05-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 3,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4556403",
      "url": "https://patchblox.com/security/fix/microsoft/kb4556403",
      "released": "2020-05-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 3,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4534976",
      "url": "https://patchblox.com/security/fix/microsoft/kb4534976",
      "released": "2020-01-14T08:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 3,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB4535102",
      "url": "https://patchblox.com/security/fix/microsoft/kb4535102",
      "released": "2020-01-14T08:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 3,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB4507411",
      "url": "https://patchblox.com/security/fix/microsoft/kb4507411",
      "released": "2019-07-09T12:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 3,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4507420",
      "url": "https://patchblox.com/security/fix/microsoft/kb4507420",
      "released": "2019-07-09T12:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 3,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4498961",
      "url": "https://patchblox.com/security/fix/microsoft/kb4498961",
      "released": "2019-05-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 4,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4499406",
      "url": "https://patchblox.com/security/fix/microsoft/kb4499406",
      "released": "2019-05-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 4,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4487078",
      "url": "https://patchblox.com/security/fix/microsoft/kb4487078",
      "released": "2019-02-12T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4487121",
      "url": "https://patchblox.com/security/fix/microsoft/kb4487121",
      "released": "2019-02-12T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4481480",
      "url": "https://patchblox.com/security/fix/microsoft/kb4481480",
      "released": "2019-01-08T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4481481",
      "url": "https://patchblox.com/security/fix/microsoft/kb4481481",
      "released": "2019-01-08T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4470600",
      "url": "https://patchblox.com/security/fix/microsoft/kb4470600",
      "released": "2018-12-11T08:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4470641",
      "url": "https://patchblox.com/security/fix/microsoft/kb4470641",
      "released": "2018-12-11T08:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4457044",
      "url": "https://patchblox.com/security/fix/microsoft/kb4457044",
      "released": "2018-09-12T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4457055",
      "url": "https://patchblox.com/security/fix/microsoft/kb4457055",
      "released": "2018-09-12T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4344152",
      "url": "https://patchblox.com/security/fix/microsoft/kb4344152",
      "released": "2018-08-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4344177",
      "url": "https://patchblox.com/security/fix/microsoft/kb4344177",
      "released": "2018-08-14T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4338423",
      "url": "https://patchblox.com/security/fix/microsoft/kb4338423",
      "released": "2018-07-10T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4338612",
      "url": "https://patchblox.com/security/fix/microsoft/kb4338612",
      "released": "2018-07-10T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4095514",
      "url": "https://patchblox.com/security/fix/microsoft/kb4095514",
      "released": "2018-05-08T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4095874",
      "url": "https://patchblox.com/security/fix/microsoft/kb4095874",
      "released": "2018-05-08T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4054176",
      "url": "https://patchblox.com/security/fix/microsoft/kb4054176",
      "released": "2018-01-18T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4054998",
      "url": "https://patchblox.com/security/fix/microsoft/kb4054998",
      "released": "2018-01-18T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 2,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4040966",
      "url": "https://patchblox.com/security/fix/microsoft/kb4040966",
      "released": "2017-09-12T07:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 1,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB4040980",
      "url": "https://patchblox.com/security/fix/microsoft/kb4040980",
      "released": "2017-09-12T07:00:00Z",
      "fixedVersion": "",
      "priority": "Patch now",
      "cveCount": 1,
      "exploitedCveCount": 1
    },
    {
      "fix": "KB4019108",
      "url": "https://patchblox.com/security/fix/microsoft/kb4019108",
      "released": "2017-05-09T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4019112",
      "url": "https://patchblox.com/security/fix/microsoft/kb4019112",
      "released": "2017-05-09T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4014981",
      "url": "https://patchblox.com/security/fix/microsoft/kb4014981",
      "released": "2017-04-11T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB4014985",
      "url": "https://patchblox.com/security/fix/microsoft/kb4014985",
      "released": "2017-04-11T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB3163245",
      "url": "https://patchblox.com/security/fix/microsoft/kb3163245",
      "released": "2016-11-08T08:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB3188730",
      "url": "https://patchblox.com/security/fix/microsoft/kb3188730",
      "released": "2016-10-11T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB3188740",
      "url": "https://patchblox.com/security/fix/microsoft/kb3188740",
      "released": "2016-10-11T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB3142024",
      "url": "https://patchblox.com/security/fix/microsoft/kb3142024",
      "released": "2016-05-10T07:00:00Z",
      "fixedVersion": "",
      "priority": "High",
      "cveCount": 1,
      "exploitedCveCount": 0
    },
    {
      "fix": "KB3142042",
      "url": "https://patchblox.com/security/fix/microsoft/kb3142042",
      "released": "2016-04-12T07:00:00Z",
      "fixedVersion": "",
      "priority": "Urgent",
      "cveCount": 1,
      "exploitedCveCount": 0
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-15T08:14:52Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}