{
  "fix": "KB5007263",
  "url": "https://patchblox.com/security/fix/microsoft/kb5007263",
  "summary": "KB5007263, released November 9, 2021, fixes 13 CVEs across 4 products. 3 of them are being exploited (CVE-2021-42287); 3 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "November 2021 security update",
  "released": "2021-11-09T14:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-42287, exploited (CISA KEV, ransomware)",
  "supported": false,
  "cveCount": 13,
  "exploitedCveCount": 3,
  "kevCveCount": 3,
  "ransomwareCveCount": 3,
  "maxEpss": 0.7717,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5007263",
  "appliesTo": [
    {
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-for-32-bit-systems-service-pack-2",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-for-32-bit-systems-service-pack-2-server-core-installation",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-for-x64-based-systems-service-pack-2",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-for-x64-based-systems-service-pack-2-server-core-installation",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-42287",
      "url": "https://patchblox.com/security/cve/CVE-2021-42287",
      "title": "Active Directory Domain Services Elevation of Privilege Vulnerability",
      "component": "Windows Active Directory",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.7717,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-42278",
      "url": "https://patchblox.com/security/cve/CVE-2021-42278",
      "title": "Active Directory Domain Services Elevation of Privilege Vulnerability",
      "component": "Windows Active Directory",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.73297,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41379",
      "url": "https://patchblox.com/security/cve/CVE-2021-41379",
      "title": "Windows Installer Elevation of Privilege Vulnerability",
      "component": "Windows Installer",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.19452,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38666",
      "url": "https://patchblox.com/security/cve/CVE-2021-38666",
      "title": "Remote Desktop Client Remote Code Execution Vulnerability",
      "component": "Windows RDP",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8.8,
      "epss": 0.15184,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-42282",
      "url": "https://patchblox.com/security/cve/CVE-2021-42282",
      "title": "Active Directory Domain Services Elevation of Privilege Vulnerability",
      "component": "Windows Active Directory",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.04173,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-42291",
      "url": "https://patchblox.com/security/cve/CVE-2021-42291",
      "title": "Active Directory Domain Services Elevation of Privilege Vulnerability",
      "component": "Windows Active Directory",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.04173,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-42275",
      "url": "https://patchblox.com/security/cve/CVE-2021-42275",
      "title": "Microsoft COM for Windows Remote Code Execution Vulnerability",
      "component": "Windows COM",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.02098,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-42283",
      "url": "https://patchblox.com/security/cve/CVE-2021-42283",
      "title": "NTFS Elevation of Privilege Vulnerability",
      "component": "Windows NTFS",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.0049,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41367",
      "url": "https://patchblox.com/security/cve/CVE-2021-41367",
      "title": "NTFS Elevation of Privilege Vulnerability",
      "component": "Windows NTFS",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.0049,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41370",
      "url": "https://patchblox.com/security/cve/CVE-2021-41370",
      "title": "NTFS Elevation of Privilege Vulnerability",
      "component": "Windows NTFS",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.0049,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41377",
      "url": "https://patchblox.com/security/cve/CVE-2021-41377",
      "title": "Windows Fast FAT File System Driver Elevation of Privilege Vulnerability",
      "component": "Windows Fast FAT Driver",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.0049,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38631",
      "url": "https://patchblox.com/security/cve/CVE-2021-38631",
      "title": "Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability",
      "component": "Windows RDP",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.4,
      "epss": 0.01879,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    },
    {
      "cveId": "CVE-2021-41371",
      "url": "https://patchblox.com/security/cve/CVE-2021-41371",
      "title": "Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability",
      "component": "Windows RDP",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.4,
      "epss": 0.01649,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    }
  ],
  "dataAsOf": "2026-11-07T12:40:37Z"
}