{
  "fix": "KB5003209",
  "url": "https://patchblox.com/security/fix/microsoft/kb5003209",
  "summary": "KB5003209, released May 11, 2021, fixes 13 CVEs across 9 products. None of them is reported as exploited. Patch Radar priority: Urgent.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "May 2021 security update",
  "released": "2021-05-11T12:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2021-28476, rated Critical",
  "supported": true,
  "cveCount": 13,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.39226,
  "maxCvss": 9.9,
  "vendorAdvisory": "https://support.microsoft.com/help/5003209",
  "appliesTo": [
    {
      "product": "Internet Explorer 11 on Windows 8.1 for 32-bit systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/internet-explorer-11-on-windows-8.1-for-32-bit-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Internet Explorer 11 on Windows 8.1 for x64-based systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/internet-explorer-11-on-windows-8.1-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Internet Explorer 11 on Windows RT 8.1",
      "productUrl": "https://patchblox.com/security/product/microsoft/internet-explorer-11-on-windows-rt-8.1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Internet Explorer 11 on Windows Server 2012 R2",
      "productUrl": "https://patchblox.com/security/product/microsoft/internet-explorer-11-on-windows-server-2012-r2",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 8.1 for 32-bit systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-8.1-for-32-bit-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows 8.1 for x64-based systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-8.1-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows RT 8.1",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-rt-8.1",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Windows Server 2012 R2",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2012-r2",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Windows Server 2012 R2 (Server Core installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/windows-server-2012-r2-server-core-installation",
      "fixedVersion": "",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2021-28476",
      "url": "https://patchblox.com/security/cve/CVE-2021-28476",
      "title": "Windows Hyper-V Remote Code Execution Vulnerability",
      "component": "Role: Windows Hyper-V",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 9.9,
      "epss": 0.39226,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-26419",
      "url": "https://patchblox.com/security/cve/CVE-2021-26419",
      "title": "Scripting Engine Memory Corruption Vulnerability",
      "component": "Internet Explorer",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 6.4,
      "epss": 0.22767,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31194",
      "url": "https://patchblox.com/security/cve/CVE-2021-31194",
      "title": "OLE Automation Remote Code Execution Vulnerability",
      "component": "Windows OLE",
      "impact": "Remote Code Execution",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 8.8,
      "epss": 0.02352,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31188",
      "url": "https://patchblox.com/security/cve/CVE-2021-31188",
      "title": "Windows Graphics Component Elevation of Privilege Vulnerability",
      "component": "Microsoft Graphics Component",
      "impact": "Elevation of Privilege",
      "priority": "Urgent",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.01368,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31186",
      "url": "https://patchblox.com/security/cve/CVE-2021-31186",
      "title": "Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability",
      "component": "Windows RDP Client",
      "impact": "Information Disclosure",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.4,
      "epss": 0.02966,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-28455",
      "url": "https://patchblox.com/security/cve/CVE-2021-28455",
      "title": "Microsoft Jet Red Database Engine and Access Connectivity Engine Remote Code Execution Vulnerability",
      "component": "Jet Red and Access Connectivity",
      "impact": "Remote Code Execution",
      "priority": "High",
      "severity": "Important",
      "cvss": 8.8,
      "epss": 0.0212,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31182",
      "url": "https://patchblox.com/security/cve/CVE-2021-31182",
      "title": "Microsoft Bluetooth Driver Spoofing Vulnerability",
      "component": "Microsoft Bluetooth Driver",
      "impact": "Spoofing",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.1,
      "epss": 0.00835,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31193",
      "url": "https://patchblox.com/security/cve/CVE-2021-31193",
      "title": "Windows SSDP Service Elevation of Privilege Vulnerability",
      "component": "Windows SSDP Service",
      "impact": "Elevation of Privilege",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.00524,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-26144",
      "url": "https://patchblox.com/security/cve/CVE-2020-26144",
      "title": "Windows Wireless Networking Spoofing Vulnerability",
      "component": "Windows Wireless Networking",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.04913,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-24588",
      "url": "https://patchblox.com/security/cve/CVE-2020-24588",
      "title": "Windows Wireless Networking Spoofing Vulnerability",
      "component": "Windows Wireless Networking",
      "impact": "Spoofing",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.03611,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2020-24587",
      "url": "https://patchblox.com/security/cve/CVE-2020-24587",
      "title": "Windows Wireless Networking Information Disclosure Vulnerability",
      "component": "Windows Wireless Networking",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 6.5,
      "epss": 0.02592,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-31184",
      "url": "https://patchblox.com/security/cve/CVE-2021-31184",
      "title": "Microsoft Windows Infrared Data Association (IrDA) Information Disclosure Vulnerability",
      "component": "Microsoft Windows IrDA",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.0156,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-28479",
      "url": "https://patchblox.com/security/cve/CVE-2021-28479",
      "title": "Windows CSC Service Information Disclosure Vulnerability",
      "component": "Windows CSC Service",
      "impact": "Information Disclosure",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.5,
      "epss": 0.0076,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}