{
  "fix": "KB5004947",
  "url": "https://patchblox.com/security/fix/microsoft/kb5004947",
  "summary": "KB5004947, released July 6, 2021, fixes 1 CVE across 5 products. One of them is being exploited (CVE-2021-34527); 1 on CISA KEV. Patch Radar priority: Patch now.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Out-of-band",
  "title": "July 2021 cumulative update for Windows 10 1809",
  "released": "2021-07-06T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-34527, exploited (CISA KEV, ransomware)",
  "supported": true,
  "cveCount": 1,
  "exploitedCveCount": 1,
  "kevCveCount": 1,
  "ransomwareCveCount": 1,
  "maxEpss": 0.99792,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5004947",
  "appliesTo": [
    {
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-1809-for-32-bit-systems",
      "fixedVersion": "17763.2029",
      "supported": true
    },
    {
      "product": "Windows 10 Version 1809 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-1809-for-arm64-based-systems",
      "fixedVersion": "17763.2029",
      "supported": false
    },
    {
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-1809-for-x64-based-systems",
      "fixedVersion": "17763.2029",
      "supported": true
    },
    {
      "product": "Windows Server 2019",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2019",
      "fixedVersion": "17763.2029",
      "supported": true
    },
    {
      "product": "Windows Server 2019 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2019-server-core-installation",
      "fixedVersion": "17763.2029",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-34527",
      "url": "https://patchblox.com/security/cve/CVE-2021-34527",
      "title": "Windows Print Spooler Remote Code Execution Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Remote Code Execution",
      "priority": "Patch now",
      "severity": "Critical",
      "cvss": 8.8,
      "epss": 0.99792,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": true
    }
  ],
  "dataAsOf": "2026-11-07T18:46:35Z"
}