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    "acknowledgments": [
      {
        "names": [
          "Bryce Abdo of Mandiant"
        ]
      },
      {
        "names": [
          "Haifei Li of EXPMON"
        ]
      },
      {
        "names": [
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        ]
      },
      {
        "names": [
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        ]
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      {
        "names": [
          "Dhanesh Kizhakkinan of Mandiant"
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    "aggregate_severity": {
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      "text": "Important"
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    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
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    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
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      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
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    "references": [
      {
        "category": "self",
        "summary": "CVE-2021-40444 Microsoft MSHTML Remote Code Execution Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444"
      },
      {
        "category": "self",
        "summary": "CVE-2021-40444 Microsoft MSHTML Remote Code Execution Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-40444.json"
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        "summary": "Microsoft Exploitability Index",
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      {
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        "summary": "Microsoft Support Lifecycle",
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      {
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        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
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    "title": "Microsoft MSHTML Remote Code Execution Vulnerability",
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      "generator": {
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          "version": "1.0"
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      "initial_release_date": "2021-09-07T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2021-09-07T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2021-09-09T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "The information in the workaround section was updated. This an informational change only."
        },
        {
          "date": "2021-09-14T07:00:00.000Z",
          "legacy_version": "2",
          "number": "3",
          "summary": "CVE updated to announce that Microsoft is releasing security updates for all affected versions of Windows to address this vulnerability. These updates include Monthly Rollups, Security Only, and IE Cumulative updates. Please see the FAQ for information on which updates are applicable to your system. Other information has been updated as well, including the following: 1) Executive Summary has been updated 2) FAQs have been added."
        },
        {
          "date": "2021-09-23T07:00:00.000Z",
          "legacy_version": "2.1",
          "number": "4",
          "summary": "For all CVEs affecting Windows that were released on September 14, 2021: 1) In the Security Updates table, the Build Numbers for KB KB5005565 have been corrected for all affected editions of the following versions of Windows 10: Windows 10, version 2004, all editions; Windows Server, version 2004 (Server Core installation); Windows 10, version 20H2; Windows Server, version 20H2 (Server Core Installation); Windows 10, version 21H1. 2) For CVEs where Windows Server 2022 is affected the links have been updated to point to information related to [5005575](https://support.microsoft.com/en-us/help/5005575). Customers whose Windows devices are configured to receive automatic updates do not need to take any further action."
        },
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          "date": "2022-08-16T07:00:00.000Z",
          "legacy_version": "2.2",
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          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
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        {
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          "title": "There are three updates listed in the Security Updates table for Windows 8.1, Windows Server 2012 R2, and Windows Server 2012. Which updates do I need to apply to my system to be protected from this vulnerability?"
        }
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          "2",
          "3",
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          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444"
        },
        {
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          "summary": "CVE-2021-40444 Microsoft MSHTML Remote Code Execution Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2021/msrc_cve-2021-40444.json"
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "PROOF_OF_CONCEPT",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "CHANGED",
            "temporalScore": 7.9,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C",
            "version": "3.1"
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Remote Code Execution"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected;Older Software Release:Exploitation Detected"
        }
      ],
      "title": "Microsoft MSHTML Remote Code Execution Vulnerability"
    }
  ]
}