{
  "cveId": "CVE-2021-33742",
  "url": "https://patchblox.com/security/cve/CVE-2021-33742",
  "summary": "CVE-2021-33742 is fixed in 30 products on 1 platform, first by KB5003638, released June 8, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021. Patch Radar priority: Patch now.",
  "title": "Windows MSHTML Platform Remote Code Execution Vulnerability",
  "description": "",
  "published": "2021-06-08T12:00:00Z",
  "severity": "Critical",
  "cvss": 7.5,
  "epss": 0.59407,
  "epssPercentile": 0.99127,
  "priority": "Patch now",
  "priorityTier": 1,
  "exploited": true,
  "vendorExploited": true,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Detected",
  "kev": {
    "added": "2021-11-03T00:00:00Z",
    "due": "2021-11-17T00:00:00Z",
    "ransomware": false,
    "requiredAction": "Apply updates per vendor instructions."
  },
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33742",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "14393.4467",
      "fix": "KB5003638",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003638",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "14393.4467",
      "fix": "KB5003638",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003638",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "17763.1999",
      "fix": "KB5003646",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003646",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for ARM64-based Systems",
      "fixedVersion": "17763.1999",
      "fix": "KB5003646",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003646",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "17763.1999",
      "fix": "KB5003646",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003646",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for 32-bit Systems",
      "fixedVersion": "18363.1621",
      "fix": "KB5003635",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003635",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for ARM64-based Systems",
      "fixedVersion": "18363.1621",
      "fix": "KB5003635",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003635",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 1909 for x64-based Systems",
      "fixedVersion": "18363.1621",
      "fix": "KB5003635",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003635",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 2004 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 20H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 20H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H1 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H1 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 Version 21H1 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5003637",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003637",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for 32-bit Systems",
      "fixedVersion": "10240.18967",
      "fix": "KB5003687",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003687",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 10 for x64-based Systems",
      "fixedVersion": "10240.18967",
      "fix": "KB5003687",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003687",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for 32-bit Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003667",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003667",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 7 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003667",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003667",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for 32-bit systems",
      "fixedVersion": "",
      "fix": "KB5003671",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003671",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for 32-bit systems",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for x64-based systems",
      "fixedVersion": "",
      "fix": "KB5003671",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003671",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 8.1 for x64-based systems",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows RT 8.1",
      "fixedVersion": "",
      "fix": "KB5003671",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003671",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 R2 for x64-based Systems Service Pack 1",
      "fixedVersion": "",
      "fix": "KB5003667",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003667",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB5003661",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003661",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for 32-bit Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB5003661",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003661",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2008 for x64-based Systems Service Pack 2",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5003697",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003697",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5003671",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003671",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5003636",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003636",
      "released": "2021-06-08T12:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2016",
      "fixedVersion": "14393.4467",
      "fix": "KB5003638",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003638",
      "released": "2021-06-08T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2019",
      "fixedVersion": "17763.1999",
      "fix": "KB5003646",
      "url": "https://patchblox.com/security/fix/microsoft/kb5003646",
      "released": "2021-06-08T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}