{
  "fix": "KB5034121",
  "url": "https://patchblox.com/security/fix/microsoft/kb5034121",
  "summary": "KB5034121, released January 9, 2024, fixes 34 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "January 2024 cumulative update for Windows 11 21H2",
  "released": "2024-01-09T00:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2024-20674, exploitation more likely",
  "supported": false,
  "cveCount": 34,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.226,
  "maxCvss": 8.8,
  "vendorAdvisory": "https://support.microsoft.com/help/5034121",
  "appliesTo": [
    {
      "product": "Windows 11 version 21H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-21h2-for-arm64-based-systems",
      "fixedVersion": "22000.2713",
      "supported": false
    },
    {
      "product": "Windows 11 version 21H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-11-version-21h2-for-x64-based-systems",
      "fixedVersion": "22000.2713",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2024-20674",
      "url": "https://patchblox.com/security/cve/CVE-2024-20674",
      "title": "Windows Kerberos Security Feature Bypass Vulnerability",
      "component": "Windows Authentication Methods",
      "impact": "Security Feature Bypass",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8.8,
      "epss": 0.17168,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21310",
      "url": "https://patchblox.com/security/cve/CVE-2024-21310",
      "title": "Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability",
      "component": "Windows Cloud Files Mini Filter Driver",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.11602,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20698",
      "url": "https://patchblox.com/security/cve/CVE-2024-20698",
      "title": "Windows Kernel Elevation of Privilege Vulnerability",
      "component": "Windows Kernel",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.08647,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20653",
      "url": "https://patchblox.com/security/cve/CVE-2024-20653",
      "title": "Microsoft Common Log File System Elevation of Privilege Vulnerability",
      "component": "Windows Common Log File System Driver",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.04493,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20683",
      "url": "https://patchblox.com/security/cve/CVE-2024-20683",
      "title": "Win32k Elevation of Privilege Vulnerability",
      "component": "Windows Win32K",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.04207,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20700",
      "url": "https://patchblox.com/security/cve/CVE-2024-20700",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 7.5,
      "epss": 0.0395,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20652",
      "url": "https://patchblox.com/security/cve/CVE-2024-20652",
      "title": "Windows HTML Platforms Security Feature Bypass Vulnerability",
      "component": "Windows Scripting",
      "impact": "Security Feature Bypass",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 8.1,
      "epss": 0.02084,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21307",
      "url": "https://patchblox.com/security/cve/CVE-2024-21307",
      "title": "Remote Desktop Client Remote Code Execution Vulnerability",
      "component": "Remote Desktop Client",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.01963,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20696",
      "url": "https://patchblox.com/security/cve/CVE-2024-20696",
      "title": "Windows libarchive Remote Code Execution Vulnerability",
      "component": "Windows Libarchive",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.3,
      "epss": 0.03154,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20661",
      "url": "https://patchblox.com/security/cve/CVE-2024-20661",
      "title": "Microsoft Message Queuing (MSMQ) Denial of Service Vulnerability",
      "component": "Windows Message Queuing",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.02759,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20687",
      "url": "https://patchblox.com/security/cve/CVE-2024-20687",
      "title": "Microsoft AllJoyn API Denial of Service Vulnerability",
      "component": "Windows AllJoyn API",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.02503,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20654",
      "url": "https://patchblox.com/security/cve/CVE-2024-20654",
      "title": "Microsoft ODBC Driver Remote Code Execution Vulnerability",
      "component": "Windows ODBC Driver",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 8,
      "epss": 0.0199,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20682",
      "url": "https://patchblox.com/security/cve/CVE-2024-20682",
      "title": "Windows Cryptographic Services Remote Code Execution Vulnerability",
      "component": "Windows Cryptographic Services",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00757,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21309",
      "url": "https://patchblox.com/security/cve/CVE-2024-21309",
      "title": "Windows Kernel-Mode Driver Elevation of Privilege Vulnerability",
      "component": "Windows Kernel-Mode Drivers",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00757,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20658",
      "url": "https://patchblox.com/security/cve/CVE-2024-20658",
      "title": "Microsoft Virtual Hard Disk Elevation of Privilege Vulnerability",
      "component": "Microsoft Virtual Hard Drive",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00706,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20681",
      "url": "https://patchblox.com/security/cve/CVE-2024-20681",
      "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": 0.007,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20657",
      "url": "https://patchblox.com/security/cve/CVE-2024-20657",
      "title": "Windows Group Policy Elevation of Privilege Vulnerability",
      "component": "Windows Group Policy",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00569,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21320",
      "url": "https://patchblox.com/security/cve/CVE-2024-21320",
      "title": "Windows Themes Spoofing Vulnerability",
      "component": "Windows Themes",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.226,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21306",
      "url": "https://patchblox.com/security/cve/CVE-2024-21306",
      "title": "Microsoft Bluetooth Driver Spoofing Vulnerability",
      "component": "Microsoft Bluetooth Driver",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.7,
      "epss": 0.0583,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20666",
      "url": "https://patchblox.com/security/cve/CVE-2024-20666",
      "title": "BitLocker Security Feature Bypass Vulnerability",
      "component": "Windows BitLocker",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.6,
      "epss": 0.03104,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21314",
      "url": "https://patchblox.com/security/cve/CVE-2024-21314",
      "title": "Microsoft Message Queuing Information Disclosure Vulnerability",
      "component": "Windows Message Queuing",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02078,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20660",
      "url": "https://patchblox.com/security/cve/CVE-2024-20660",
      "title": "Microsoft Message Queuing Information Disclosure Vulnerability",
      "component": "Windows Message Queuing",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02039,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20680",
      "url": "https://patchblox.com/security/cve/CVE-2024-20680",
      "title": "Windows Message Queuing Client (MSMQC) Information Disclosure",
      "component": "Windows Message Queuing",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02039,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20664",
      "url": "https://patchblox.com/security/cve/CVE-2024-20664",
      "title": "Microsoft Message Queuing Information Disclosure Vulnerability",
      "component": "Windows Message Queuing",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01997,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20663",
      "url": "https://patchblox.com/security/cve/CVE-2024-20663",
      "title": "Windows Message Queuing Client (MSMQC) Information Disclosure",
      "component": "Windows Message Queuing",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01925,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21313",
      "url": "https://patchblox.com/security/cve/CVE-2024-21313",
      "title": "Windows TCP/IP Information Disclosure Vulnerability",
      "component": "Windows TCP/IP",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.3,
      "epss": 0.01499,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21305",
      "url": "https://patchblox.com/security/cve/CVE-2024-21305",
      "title": "Hypervisor-Protected Code Integrity (HVCI) Security Feature Bypass Vulnerability",
      "component": "Unified Extensible Firmware Interface",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.4,
      "epss": 0.01494,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21316",
      "url": "https://patchblox.com/security/cve/CVE-2024-21316",
      "title": "Windows Server Key Distribution Service Security Feature Bypass",
      "component": "Windows Server Key Distribution Service",
      "impact": "Security Feature Bypass",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.1,
      "epss": 0.01475,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20690",
      "url": "https://patchblox.com/security/cve/CVE-2024-20690",
      "title": "Windows Nearby Sharing Spoofing Vulnerability",
      "component": "Windows Nearby Sharing",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.01325,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20692",
      "url": "https://patchblox.com/security/cve/CVE-2024-20692",
      "title": "Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability",
      "component": "Windows Local Security Authority Subsystem Service (LSASS)",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.7,
      "epss": 0.01183,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20694",
      "url": "https://patchblox.com/security/cve/CVE-2024-20694",
      "title": "Windows CoreMessaging Information Disclosure  Vulnerability",
      "component": "Windows Collaborative Translation Framework",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00887,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-21311",
      "url": "https://patchblox.com/security/cve/CVE-2024-21311",
      "title": "Windows Cryptographic Services Information Disclosure Vulnerability",
      "component": "Windows Cryptographic Services",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00783,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20699",
      "url": "https://patchblox.com/security/cve/CVE-2024-20699",
      "title": "Windows Hyper-V Denial of Service Vulnerability",
      "component": "Windows Hyper-V",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.00739,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-20691",
      "url": "https://patchblox.com/security/cve/CVE-2024-20691",
      "title": "Windows Themes Information Disclosure Vulnerability",
      "component": "Windows Themes",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 4.7,
      "epss": 0.00587,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}