{
  "fix": "KB5006743",
  "url": "https://patchblox.com/security/fix/microsoft/kb5006743",
  "summary": "KB5006743, released October 12, 2021, fixes 20 CVEs across 4 products. One of them is being exploited (CVE-2021-40449); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "October 2021 security update",
  "released": "2021-10-12T12:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-40449, exploited (CISA KEV, ransomware)",
  "supported": false,
  "cveCount": 20,
  "exploitedCveCount": 1,
  "kevCveCount": 1,
  "ransomwareCveCount": 1,
  "maxEpss": 0.81936,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5006743",
  "appliesTo": [
    {
      "product": "Windows 7 for 32-bit Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-7-for-32-bit-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 7 for x64-based Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-7-for-x64-based-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2008-r2-for-x64-based-systems-service-pack-1-server-core-installation",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-40449",
      "url": "https://patchblox.com/security/cve/CVE-2021-40449",
      "title": "Win32k Elevation of Privilege Vulnerability",
      "component": "Windows Win32K",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.81936,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36970",
      "url": "https://patchblox.com/security/cve/CVE-2021-36970",
      "title": "Windows Print Spooler Spoofing Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Spoofing",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.03059,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40443",
      "url": "https://patchblox.com/security/cve/CVE-2021-40443",
      "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability",
      "component": "Windows Common Log File System Driver",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00651,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40466",
      "url": "https://patchblox.com/security/cve/CVE-2021-40466",
      "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability",
      "component": "Windows Common Log File System Driver",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00651,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40467",
      "url": "https://patchblox.com/security/cve/CVE-2021-40467",
      "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability",
      "component": "Windows Common Log File System Driver",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00543,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40469",
      "url": "https://patchblox.com/security/cve/CVE-2021-40469",
      "title": "Windows DNS Server Remote Code Execution Vulnerability",
      "component": "Role: DNS Server",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.2,
      "epss": 0.07576,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    },
    {
      "cveId": "CVE-2021-36953",
      "url": "https://patchblox.com/security/cve/CVE-2021-36953",
      "title": "Windows TCP/IP Denial of Service Vulnerability",
      "component": "Windows TCP/IP",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.05046,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40465",
      "url": "https://patchblox.com/security/cve/CVE-2021-40465",
      "title": "Windows Text Shaping Remote Code Execution Vulnerability",
      "component": "Windows Text Shaping",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02467,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41331",
      "url": "https://patchblox.com/security/cve/CVE-2021-41331",
      "title": "Windows Media Audio Decoder Remote Code Execution Vulnerability",
      "component": "Microsoft Windows Codecs Library",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02027,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41340",
      "url": "https://patchblox.com/security/cve/CVE-2021-41340",
      "title": "Windows Graphics Component Remote Code Execution Vulnerability",
      "component": "Microsoft Graphics Component",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02027,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41335",
      "url": "https://patchblox.com/security/cve/CVE-2021-41335",
      "title": "Windows Kernel Elevation of Privilege Vulnerability",
      "component": "Windows Kernel",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.0137,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    },
    {
      "cveId": "CVE-2021-40489",
      "url": "https://patchblox.com/security/cve/CVE-2021-40489",
      "title": "Storage Spaces Controller Elevation of Privilege Vulnerability",
      "component": "Windows Storage Spaces Controller",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00838,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-26442",
      "url": "https://patchblox.com/security/cve/CVE-2021-26442",
      "title": "Windows HTTP.sys Elevation of Privilege Vulnerability",
      "component": "Windows HTTP.sys",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.0079,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41332",
      "url": "https://patchblox.com/security/cve/CVE-2021-41332",
      "title": "Windows Print Spooler Information Disclosure Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02715,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41342",
      "url": "https://patchblox.com/security/cve/CVE-2021-41342",
      "title": "Windows MSHTML Platform Remote Code Execution Vulnerability",
      "component": "Windows MSHTML Platform",
      "impact": "Remote Code Execution",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.8,
      "epss": 0.01629,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40460",
      "url": "https://patchblox.com/security/cve/CVE-2021-40460",
      "title": "Windows Remote Procedure Call Runtime Security Feature Bypass Vulnerability",
      "component": "Windows Remote Procedure Call Runtime",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01608,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38662",
      "url": "https://patchblox.com/security/cve/CVE-2021-38662",
      "title": "Windows Fast FAT File System Driver Information Disclosure Vulnerability",
      "component": "Windows Fast FAT Driver",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00777,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38663",
      "url": "https://patchblox.com/security/cve/CVE-2021-38663",
      "title": "Windows exFAT File System Information Disclosure Vulnerability",
      "component": "Windows exFAT File System",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00732,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41343",
      "url": "https://patchblox.com/security/cve/CVE-2021-41343",
      "title": "Windows Fast FAT File System Driver Information Disclosure Vulnerability",
      "component": "Windows Fast FAT Driver",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00732,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40455",
      "url": "https://patchblox.com/security/cve/CVE-2021-40455",
      "title": "Windows Installer Spoofing Vulnerability",
      "component": "Windows Installer",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00563,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}