{
  "fix": "KB5077181",
  "url": "https://patchblox.com/security/fix/microsoft/kb5077181",
  "summary": "KB5077181, released February 10, 2026, fixes 27 CVEs across 4 products. 5 of them are being exploited (CVE-2026-21510); 5 on CISA KEV. Patch Radar priority: Patch now.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "February 2026 cumulative update for Windows 11 24H2",
  "released": "2026-02-10T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2026-21510, exploited (CISA KEV)",
  "supported": true,
  "cveCount": 27,
  "exploitedCveCount": 5,
  "kevCveCount": 5,
  "ransomwareCveCount": 0,
  "maxEpss": 0.61238,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5077181",
  "appliesTo": [
    {
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-24h2-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-24h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Windows 11 Version 25H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-25h2-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Windows 11 Version 25H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-25h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-21510",
      "url": "https://patchblox.com/security/cve/CVE-2026-21510",
      "title": "Windows Shell Security Feature Bypass Vulnerability",
      "component": "Windows Shell",
      "impact": "Security Feature Bypass",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.61238,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": true
    },
    {
      "cveId": "CVE-2026-21513",
      "url": "https://patchblox.com/security/cve/CVE-2026-21513",
      "title": "MSHTML Framework Security Feature Bypass Vulnerability",
      "component": "MSHTML Framework",
      "impact": "Security Feature Bypass",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.15852,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": true
    },
    {
      "cveId": "CVE-2026-21525",
      "url": "https://patchblox.com/security/cve/CVE-2026-21525",
      "title": "Windows Remote Access Connection Manager Denial of Service Vulnerability",
      "component": "Windows Remote Access Connection Manager",
      "impact": "Denial of Service",
      "priority": "Patch now",
      "severity": "Moderate",
      "cvss": 6.2,
      "epss": 0.05041,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21533",
      "url": "https://patchblox.com/security/cve/CVE-2026-21533",
      "title": "Windows Remote Desktop Services Elevation of Privilege Vulnerability",
      "component": "Windows Remote Desktop",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.04335,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21519",
      "url": "https://patchblox.com/security/cve/CVE-2026-21519",
      "title": "Desktop Window Manager Elevation of Privilege Vulnerability",
      "component": "Desktop Window Manager",
      "impact": "Elevation of Privilege",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02567,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21238",
      "url": "https://patchblox.com/security/cve/CVE-2026-21238",
      "title": "Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability",
      "component": "Windows Ancillary Function Driver for WinSock",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.03329,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21241",
      "url": "https://patchblox.com/security/cve/CVE-2026-21241",
      "title": "Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability",
      "component": "Windows Ancillary Function Driver for WinSock",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.02563,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21231",
      "url": "https://patchblox.com/security/cve/CVE-2026-21231",
      "title": "Windows Kernel Elevation of Privilege Vulnerability",
      "component": "Windows Kernel",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.02518,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21253",
      "url": "https://patchblox.com/security/cve/CVE-2026-21253",
      "title": "Mailslot File System Elevation of Privilege Vulnerability",
      "component": "Mailslot File System",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.0079,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-20846",
      "url": "https://patchblox.com/security/cve/CVE-2026-20846",
      "title": "GDI\u002B Denial of Service Vulnerability",
      "component": "Windows GDI\u002B",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.01409,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21244",
      "url": "https://patchblox.com/security/cve/CVE-2026-21244",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.3,
      "epss": 0.01308,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21248",
      "url": "https://patchblox.com/security/cve/CVE-2026-21248",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.3,
      "epss": 0.01308,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21250",
      "url": "https://patchblox.com/security/cve/CVE-2026-21250",
      "title": "Windows HTTP.sys Elevation of Privilege Vulnerability",
      "component": "Windows HTTP.sys",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.01094,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21247",
      "url": "https://patchblox.com/security/cve/CVE-2026-21247",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.3,
      "epss": 0.00576,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21508",
      "url": "https://patchblox.com/security/cve/CVE-2026-21508",
      "title": "Windows Storage Elevation of Privilege Vulnerability",
      "component": "Windows Storage",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00444,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21232",
      "url": "https://patchblox.com/security/cve/CVE-2026-21232",
      "title": "Windows HTTP.sys Elevation of Privilege Vulnerability",
      "component": "Windows HTTP.sys",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21236",
      "url": "https://patchblox.com/security/cve/CVE-2026-21236",
      "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": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21239",
      "url": "https://patchblox.com/security/cve/CVE-2026-21239",
      "title": "Windows Kernel Elevation of Privilege Vulnerability",
      "component": "Windows Kernel",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21245",
      "url": "https://patchblox.com/security/cve/CVE-2026-21245",
      "title": "Windows Kernel Elevation of Privilege Vulnerability",
      "component": "Windows Kernel",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21246",
      "url": "https://patchblox.com/security/cve/CVE-2026-21246",
      "title": "Windows Graphics Component Elevation of Privilege Vulnerability",
      "component": "Microsoft Graphics Component",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00439,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21255",
      "url": "https://patchblox.com/security/cve/CVE-2026-21255",
      "title": "Windows Hyper-V Security Feature Bypass Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Security Feature Bypass",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.00375,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21242",
      "url": "https://patchblox.com/security/cve/CVE-2026-21242",
      "title": "Windows Subsystem for Linux Elevation of Privilege Vulnerability",
      "component": "Windows Subsystem for Linux",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00358,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21240",
      "url": "https://patchblox.com/security/cve/CVE-2026-21240",
      "title": "Windows HTTP.sys Elevation of Privilege Vulnerability",
      "component": "Windows HTTP.sys",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00276,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21234",
      "url": "https://patchblox.com/security/cve/CVE-2026-21234",
      "title": "Windows Connected Devices Platform Service Elevation of Privilege Vulnerability",
      "component": "Windows Connected Devices Platform Service",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00269,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21237",
      "url": "https://patchblox.com/security/cve/CVE-2026-21237",
      "title": "Windows Subsystem for Linux Elevation of Privilege Vulnerability",
      "component": "Windows Subsystem for Linux",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00269,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21249",
      "url": "https://patchblox.com/security/cve/CVE-2026-21249",
      "title": "Windows NTLM Spoofing Vulnerability",
      "component": "Windows NTLM",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 3.3,
      "epss": 0.11279,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-21222",
      "url": "https://patchblox.com/security/cve/CVE-2026-21222",
      "title": "Windows Kernel Information Disclosure Vulnerability",
      "component": "Windows Kernel",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00599,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T12:40:37Z"
}