{
  "fix": "KB5006672",
  "url": "https://patchblox.com/security/fix/microsoft/kb5006672",
  "summary": "KB5006672, released October 12, 2021, fixes 41 CVEs across 5 products. 2 of them are being exploited (CVE-2021-40449); 2 on CISA KEV. Patch Radar priority: Patch now.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "October 2021 cumulative update for Windows 10 1809",
  "released": "2021-10-12T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-40449, exploited (CISA KEV, ransomware)",
  "supported": true,
  "cveCount": 41,
  "exploitedCveCount": 2,
  "kevCveCount": 2,
  "ransomwareCveCount": 1,
  "maxEpss": 0.81936,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5006672",
  "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": "17763.2237",
      "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": "17763.2237",
      "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": "17763.2237",
      "supported": true
    },
    {
      "product": "Windows Server 2019",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2019",
      "fixedVersion": "17763.2237",
      "supported": true
    },
    {
      "product": "Windows Server 2019 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2019-server-core-installation",
      "fixedVersion": "17763.2237",
      "supported": true
    }
  ],
  "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-2021-40450",
      "url": "https://patchblox.com/security/cve/CVE-2021-40450",
      "title": "Win32k Elevation of Privilege Vulnerability",
      "component": "Windows Win32K",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.01582,
      "kev": true,
      "ransomware": false,
      "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-2021-40461",
      "url": "https://patchblox.com/security/cve/CVE-2021-40461",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8,
      "epss": 0.01362,
      "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-2021-40470",
      "url": "https://patchblox.com/security/cve/CVE-2021-40470",
      "title": "DirectX Graphics Kernel Elevation of Privilege Vulnerability",
      "component": "Windows DirectX",
      "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-2021-40463",
      "url": "https://patchblox.com/security/cve/CVE-2021-40463",
      "title": "Windows Network Address Translation (NAT) Denial of Service Vulnerability",
      "component": "Windows Network Address Translation (NAT)",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.7,
      "epss": 0.02576,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40462",
      "url": "https://patchblox.com/security/cve/CVE-2021-40462",
      "title": "Windows Media Foundation Dolby Digital Atmos Decoders Remote Code Execution Vulnerability",
      "component": "Microsoft Windows Codecs Library",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02519,
      "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-2021-40476",
      "url": "https://patchblox.com/security/cve/CVE-2021-40476",
      "title": "Windows AppContainer Elevation Of Privilege Vulnerability",
      "component": "Windows AppContainer",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.02403,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41330",
      "url": "https://patchblox.com/security/cve/CVE-2021-41330",
      "title": "Microsoft Windows Media Foundation 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-2021-41331",
      "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-2021-40488",
      "url": "https://patchblox.com/security/cve/CVE-2021-40488",
      "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": 0.01002,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-26441",
      "url": "https://patchblox.com/security/cve/CVE-2021-26441",
      "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": 0.00944,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40478",
      "url": "https://patchblox.com/security/cve/CVE-2021-40478",
      "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-2021-40489",
      "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-2021-41345",
      "url": "https://patchblox.com/security/cve/CVE-2021-41345",
      "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": 0.00827,
      "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-2021-41347",
      "url": "https://patchblox.com/security/cve/CVE-2021-41347",
      "title": "Windows AppX Deployment Service Elevation of Privilege Vulnerability",
      "component": "Windows AppX Deployment Service",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00706,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40477",
      "url": "https://patchblox.com/security/cve/CVE-2021-40477",
      "title": "Windows Event Tracing Elevation of Privilege Vulnerability",
      "component": "Windows Event Tracing",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00582,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40464",
      "url": "https://patchblox.com/security/cve/CVE-2021-40464",
      "title": "Windows Nearby Sharing Elevation of Privilege Vulnerability",
      "component": "Windows Nearby Sharing",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 8,
      "epss": 0.00552,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41338",
      "url": "https://patchblox.com/security/cve/CVE-2021-41338",
      "title": "Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability",
      "component": "Windows AppContainer",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.03299,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    },
    {
      "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-2021-40456",
      "url": "https://patchblox.com/security/cve/CVE-2021-40456",
      "title": "Windows AD FS Security Feature Bypass Vulnerability",
      "component": "Role: Windows AD FS Server",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.3,
      "epss": 0.02341,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41337",
      "url": "https://patchblox.com/security/cve/CVE-2021-41337",
      "title": "Active Directory Security Feature Bypass Vulnerability",
      "component": "Role: Windows Active Directory Server",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.9,
      "epss": 0.01635,
      "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-2021-38624",
      "url": "https://patchblox.com/security/cve/CVE-2021-38624",
      "title": "Windows Key Storage Provider Security Feature Bypass Vulnerability",
      "component": "Windows Key Storage Provider",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01534,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41361",
      "url": "https://patchblox.com/security/cve/CVE-2021-41361",
      "title": "Active Directory Federation Server Spoofing Vulnerability",
      "component": "Active Directory Federation Services",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.4,
      "epss": 0.0095,
      "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-2021-40475",
      "url": "https://patchblox.com/security/cve/CVE-2021-40475",
      "title": "Windows Cloud Files Mini Filter Driver Information Disclosure Vulnerability",
      "component": "Windows Cloud Files Mini Filter Driver",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00732,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-41343",
      "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
    },
    {
      "cveId": "CVE-2021-40454",
      "url": "https://patchblox.com/security/cve/CVE-2021-40454",
      "title": "Rich Text Edit Control Information Disclosure Vulnerability",
      "component": "Rich Text Edit Control",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00498,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}