{
  "fix": "KB5005565",
  "url": "https://patchblox.com/security/fix/microsoft/kb5005565",
  "summary": "KB5005565, released September 14, 2021, fixes 34 CVEs across 11 products. 2 of them are being exploited (CVE-2021-40444); 2 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "September 2021 cumulative update for Windows 10 2004",
  "released": "2021-09-14T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-40444, exploited (CISA KEV, ransomware)",
  "supported": false,
  "cveCount": 34,
  "exploitedCveCount": 2,
  "kevCveCount": 2,
  "ransomwareCveCount": 2,
  "maxEpss": 0.9784,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5005565",
  "appliesTo": [
    {
      "product": "Windows 10 Version 2004 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-2004-for-32-bit-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 2004 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-2004-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 2004 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-2004-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 20H2 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-20h2-for-32-bit-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 20H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-20h2-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 20H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-20h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 21H1 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-21h1-for-32-bit-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 21H1 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-21h1-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 10 Version 21H1 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-10-version-21h1-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server, version 2004 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-version-2004-server-core-installation",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server, version 20H2 (Server Core Installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-version-20h2-server-core-installation",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-40444",
      "url": "https://patchblox.com/security/cve/CVE-2021-40444",
      "title": "Microsoft MSHTML Remote Code Execution Vulnerability",
      "component": "Windows MSHTML Platform",
      "impact": "Remote Code Execution",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.9784,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": true
    },
    {
      "cveId": "CVE-2021-36955",
      "url": "https://patchblox.com/security/cve/CVE-2021-36955",
      "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability",
      "component": "Windows Common Log File System Driver",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.04071,
      "kev": true,
      "ransomware": true,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36958",
      "url": "https://patchblox.com/security/cve/CVE-2021-36958",
      "title": "Windows Print Spooler Remote Code Execution Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.30794,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": true
    },
    {
      "cveId": "CVE-2021-26435",
      "url": "https://patchblox.com/security/cve/CVE-2021-26435",
      "title": "Windows Scripting Engine Memory Corruption Vulnerability",
      "component": "Windows Scripting",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8.1,
      "epss": 0.05379,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36965",
      "url": "https://patchblox.com/security/cve/CVE-2021-36965",
      "title": "Windows WLAN AutoConfig Service Remote Code Execution Vulnerability",
      "component": "Windows WLAN Auto Config Service",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8.8,
      "epss": 0.0468,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38639",
      "url": "https://patchblox.com/security/cve/CVE-2021-38639",
      "title": "Win32k Elevation of Privilege Vulnerability",
      "component": "Windows Win32K",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.01363,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36975",
      "url": "https://patchblox.com/security/cve/CVE-2021-36975",
      "title": "Win32k Elevation of Privilege Vulnerability",
      "component": "Windows Win32K",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.01325,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36963",
      "url": "https://patchblox.com/security/cve/CVE-2021-36963",
      "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": 0.01216,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38633",
      "url": "https://patchblox.com/security/cve/CVE-2021-38633",
      "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": 0.01026,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38671",
      "url": "https://patchblox.com/security/cve/CVE-2021-38671",
      "title": "Windows Print Spooler Elevation of Privilege Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00554,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-1678",
      "url": "https://patchblox.com/security/cve/CVE-2021-1678",
      "title": "Windows Print Spooler Spoofing Vulnerability",
      "component": "Windows NTLM",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.10031,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36960",
      "url": "https://patchblox.com/security/cve/CVE-2021-36960",
      "title": "Windows SMB Information Disclosure Vulnerability",
      "component": "Windows SMB",
      "impact": "Information Disclosure",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.03293,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36967",
      "url": "https://patchblox.com/security/cve/CVE-2021-36967",
      "title": "Windows WLAN AutoConfig Service Elevation of Privilege Vulnerability",
      "component": "Windows WLAN Service",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 8,
      "epss": 0.00917,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38634",
      "url": "https://patchblox.com/security/cve/CVE-2021-38634",
      "title": "Microsoft Windows Update Client Elevation of Privilege Vulnerability",
      "component": "Windows Update",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.1,
      "epss": 0.0087,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-40447",
      "url": "https://patchblox.com/security/cve/CVE-2021-40447",
      "title": "Windows Print Spooler Elevation of Privilege Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00705,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38667",
      "url": "https://patchblox.com/security/cve/CVE-2021-38667",
      "title": "Windows Print Spooler Elevation of Privilege Vulnerability",
      "component": "Windows Print Spooler Components",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00554,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36954",
      "url": "https://patchblox.com/security/cve/CVE-2021-36954",
      "title": "Windows Bind Filter Driver Elevation of Privilege Vulnerability",
      "component": "Windows Bind Filter Driver",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36964",
      "url": "https://patchblox.com/security/cve/CVE-2021-36964",
      "title": "Windows Event Tracing Elevation of Privilege Vulnerability",
      "component": "Windows Event Tracing",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36966",
      "url": "https://patchblox.com/security/cve/CVE-2021-36966",
      "title": "Windows Subsystem for Linux Elevation of Privilege Vulnerability",
      "component": "Windows Subsystem for Linux",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36973",
      "url": "https://patchblox.com/security/cve/CVE-2021-36973",
      "title": "Windows Redirected Drive Buffering System Elevation of Privilege Vulnerability",
      "component": "Windows Redirected Drive Buffering",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36974",
      "url": "https://patchblox.com/security/cve/CVE-2021-36974",
      "title": "Windows SMB Elevation of Privilege Vulnerability",
      "component": "Windows SMB",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38628",
      "url": "https://patchblox.com/security/cve/CVE-2021-38628",
      "title": "Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability",
      "component": "Windows Ancillary Function Driver for WinSock",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38630",
      "url": "https://patchblox.com/security/cve/CVE-2021-38630",
      "title": "Windows Event Tracing Elevation of Privilege Vulnerability",
      "component": "Windows Event Tracing",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00527,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38638",
      "url": "https://patchblox.com/security/cve/CVE-2021-38638",
      "title": "Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability",
      "component": "Windows Ancillary Function Driver for WinSock",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00523,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38629",
      "url": "https://patchblox.com/security/cve/CVE-2021-38629",
      "title": "Windows Ancillary Function Driver for WinSock Information Disclosure Vulnerability",
      "component": "Windows TDX.sys",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02688,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36959",
      "url": "https://patchblox.com/security/cve/CVE-2021-36959",
      "title": "Windows Authenticode Spoofing Vulnerability",
      "component": "Windows Authenticode",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.01346,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36962",
      "url": "https://patchblox.com/security/cve/CVE-2021-36962",
      "title": "Windows Installer Information Disclosure Vulnerability",
      "component": "Windows Installer",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.01286,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36961",
      "url": "https://patchblox.com/security/cve/CVE-2021-36961",
      "title": "Windows Installer Denial of Service Vulnerability",
      "component": "Windows Installer",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.01062,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36969",
      "url": "https://patchblox.com/security/cve/CVE-2021-36969",
      "title": "Windows Redirected Drive Buffering SubSystem Driver Information Disclosure Vulnerability",
      "component": "Windows Redirected Drive Buffering",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00876,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-36972",
      "url": "https://patchblox.com/security/cve/CVE-2021-36972",
      "title": "Windows SMB Information Disclosure Vulnerability",
      "component": "Windows SMB",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00876,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38635",
      "url": "https://patchblox.com/security/cve/CVE-2021-38635",
      "title": "Windows Redirected Drive Buffering SubSystem Driver Information Disclosure Vulnerability",
      "component": "Windows Redirected Drive Buffering",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00876,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38636",
      "url": "https://patchblox.com/security/cve/CVE-2021-38636",
      "title": "Windows Redirected Drive Buffering SubSystem Driver Information Disclosure Vulnerability",
      "component": "Windows Redirected Drive Buffering",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00876,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38637",
      "url": "https://patchblox.com/security/cve/CVE-2021-38637",
      "title": "Windows Storage Information Disclosure Vulnerability",
      "component": "Windows Storage",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00876,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-38632",
      "url": "https://patchblox.com/security/cve/CVE-2021-38632",
      "title": "BitLocker Security Feature Bypass Vulnerability",
      "component": "Windows BitLocker",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.7,
      "epss": 0.00829,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}