{"schemaVersion":3,"id":"CVE-2021-40444","aliases":[],"status":"published","duplicateOf":null,"title":"Microsoft MSHTML Remote Code Execution Vulnerability","description":"Microsoft is investigating reports of a remote code execution vulnerability in MSHTML that affects Microsoft Windows. Microsoft is aware of targeted attacks that attempt to exploit this vulnerability by using specially-crafted Microsoft Office documents.\nAn attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.\nMicrosoft Defender Antivirus and Microsoft Defender for Endpoint both provide detection and protections for the known vulnerability. Customers should keep antimalware products up to date. Customers who utilize automatic updates do not need to take additional action. Enterprise customers who manage updates should select the detection build 1.349.22.0 or newer and deploy it across their environments. Microsoft Defender for Endpoint alerts will be displayed as: “Suspicious Cpl File Execution”.\nUpon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.\nPlease see the Mitigations and Workaround sections for important information about steps you can take to protect your system from this vulnerability.\nUPDATE September 14, 2021: Microsoft has released security updates to address this vulnerability. Please see the Security Updates table for the applicable update for your system. We recommend that you install these updates immediately. Please see the FAQ for important information about which updates are applicable to your system.","dates":{"published":"2021-09-15T11:24:26.000Z","modified":"2026-08-10T15:10:57.757Z","reserved":null,"kevAdded":["2021-11-03T00:00:00.000Z"],"kevDue":["2021-11-17T00:00:00.000Z"]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.8,"severity":"high","vector":"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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.9784,"percentile":0.99909,"severity":"critical","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.39000000000000146,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.9745},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.9784,"percentile":0.99909}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.9745,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.9784,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.9784,"percentile":0.99909}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2021-11-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft MSHTML Remote Code Execution Vulnerability","description":"Microsoft MSHTML contains a unspecified vulnerability that allows for remote code execution.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2021-40444","label":"nvd.nist.gov/vuln/detail/CVE-2021-40444"}],"vendor":"Microsoft","product":"MSHTML","ransomware":true,"ransomwareUse":"Known","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2021-11-03T00:00:00.000Z","dueDate":"2021-11-17T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Microsoft MSHTML Remote Code Execution Vulnerability","description":"Microsoft MSHTML contains a unspecified vulnerability that allows for remote code execution.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2021-40444","label":"nvd.nist.gov/vuln/detail/CVE-2021-40444"}],"vendor":"Microsoft","product":"MSHTML","ransomware":true,"ransomwareUse":"Known","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"known","sources":["cisa"]},"exploits":[{"id":"REF_1293ED29B227EE8C","name":"Exploit Reference (packetstormsecurity.com)","source":"reference","url":"http://packetstormsecurity.com/files/165214/Microsoft-Office-Word-MSHTML-Remote-Code-Execution.html","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"REF_63587852AC01E264","name":"Exploit Reference (packetstormsecurity.com)","source":"reference","url":"http://packetstormsecurity.com/files/167317/Microsoft-Office-MSDT-Follina-Proof-Of-Concept.html","maturity":"unknown","reliabilityScore":0.2,"verified":false,"type":null,"platforms":[],"requiresAuth":null,"exploitdb":null,"metasploit":null},{"id":"MSF_EXPLOIT_WINDOWS_FILEFORMAT_WORD_MSHTML_RCE","name":"Microsoft Office Word Malicious MSHTML RCE","source":"metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploit/windows/fileformat/word_mshtml_rce.rb","maturity":"weaponized","reliabilityScore":1,"verified":true,"type":"remote","platforms":[],"requiresAuth":false,"exploitdb":null,"metasploit":{"fullname":"exploit/windows/fileformat/word_mshtml_rce","rank":"600","rankName":"excellent","postAuth":false,"check":false,"stability":["crash-safe"],"sideEffects":["ioc-in-logs","artifacts-on-disk"],"reliability":["unreliable-session"]}}],"exploitCount":3,"weaknesses":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"microsoft","product":"windows_10_1507","name":"windows 10 1507","label":"windows_10_1507","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.10240.19060","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.10240.19060","eol":null,"hubHref":"/vendor/microsoft/windows_10_1507"},{"vendor":"microsoft","product":"windows_10_1607","name":"windows 10 1607","label":"windows_10_1607","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.14393.4651","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.14393.4651","eol":null,"hubHref":"/vendor/microsoft/windows_10_1607"},{"vendor":"microsoft","product":"windows_10_1809","name":"windows 10 1809","label":"windows_10_1809","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.17763.2183","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.17763.2183","eol":null,"hubHref":"/vendor/microsoft/windows_10_1809"},{"vendor":"microsoft","product":"windows_10_1909","name":"windows 10 1909","label":"windows_10_1909","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.18363.1801","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.18363.1801","eol":null,"hubHref":"/vendor/microsoft/windows_10_1909"},{"vendor":"microsoft","product":"windows_10_2004","name":"windows 10 2004","label":"windows_10_2004","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19041.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19041.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_2004"},{"vendor":"microsoft","product":"windows_10_20h2","name":"windows 10 20h2","label":"windows_10_20h2","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19042.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19042.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_20h2"},{"vendor":"microsoft","product":"windows_10_21h1","name":"windows 10 21h1","label":"windows_10_21h1","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19043.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19043.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_21h1"},{"vendor":"microsoft","product":"windows 10 version 1507","name":"Windows 10 Version 1507","label":"windows 10 version 1507","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.10240.0, < 10.0.10240.19060","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.10240.0, < 10.0.10240.19060","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1507"},{"vendor":"microsoft","product":"windows 10 version 1607","name":"Windows 10 Version 1607","label":"windows 10 version 1607","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.14393.0, < 10.0.14393.4651","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.14393.0, < 10.0.14393.4651","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1607"},{"vendor":"microsoft","product":"windows 10 version 1809","name":"Windows 10 Version 1809","label":"windows 10 version 1809","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.17763.0, < 10.0.17763.2183","noFixRecorded":false,"fixedIn":null},{"text":"≥ 10.0.0, < 10.0.17763.2183","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.17763.0, < 10.0.17763.2183 | ≥ 10.0.0, < 10.0.17763.2183","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1809"},{"vendor":"microsoft","product":"windows 10 version 1909","name":"Windows 10 Version 1909","label":"windows 10 version 1909","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.18363.1801","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.18363.1801","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_1909"},{"vendor":"microsoft","product":"windows 10 version 2004","name":"Windows 10 Version 2004","label":"windows 10 version 2004","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19041.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19041.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_2004"},{"vendor":"microsoft","product":"windows 10 version 20h2","name":"Windows 10 Version 20H2","label":"windows 10 version 20h2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19042.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19042.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_20h2"},{"vendor":"microsoft","product":"windows 10 version 21h1","name":"Windows 10 Version 21H1","label":"windows 10 version 21h1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19043.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19043.1237","eol":null,"hubHref":"/vendor/microsoft/windows_10_version_21h1"},{"vendor":"microsoft","product":"windows_7","name":"windows 7","label":"windows_7","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.0, < 6.1.7601.25712","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.0, < 6.1.7601.25712 | na","eol":null,"hubHref":"/vendor/microsoft/windows_7"},{"vendor":"microsoft","product":"windows 7 service pack 1","name":"Windows 7 Service Pack 1","label":"windows 7 service pack 1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.0, < 6.1.7601.25712","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.0, < 6.1.7601.25712","eol":null,"hubHref":"/vendor/microsoft/windows_7_service_pack_1"},{"vendor":"microsoft","product":"windows_8.1","name":"windows 8.1","label":"windows_8.1","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 6.3.0, < 6.3.9600.20120","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.3.0, < 6.3.9600.20120 | na","eol":null,"hubHref":"/vendor/microsoft/windows_81"},{"vendor":"microsoft","product":"windows_rt_8.1","name":"windows rt 8.1","label":"windows_rt_8.1","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/microsoft/windows_rt_81"},{"vendor":"microsoft","product":"windows_server_2004","name":"windows server 2004","label":"windows_server_2004","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19041.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19041.1237","eol":null,"hubHref":"/vendor/microsoft/windows_server_2004"},{"vendor":"microsoft","product":"windows_server_2008","name":"windows server 2008","label":"windows_server_2008","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null},{"text":"r2:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"na | r2:sp1","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1","name":"Windows Server 2008 R2 Service Pack 1","label":"windows server 2008 r2 service pack 1","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.7601.0, < 6.1.7601.25712","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.7601.0, < 6.1.7601.25712","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_r2_service_pack_1"},{"vendor":"microsoft","product":"windows server 2008 r2 service pack 1 (server core installation)","name":"Windows Server 2008 R2 Service Pack 1 (Server Core installation)","label":"windows server 2008 r2 service pack 1 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.1.7601.0, < 6.1.7601.25712","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.1.7601.0, < 6.1.7601.25712","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_r2_service_pack_1_server_core_installation"},{"vendor":"microsoft","product":"windows server 2008 service pack 2","name":"Windows Server 2008 Service Pack 2","label":"windows server 2008 service pack 2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0.6003.0, < 6.0.6003.21218","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0.6003.0, < 6.0.6003.21218","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_service_pack_2"},{"vendor":"microsoft","product":"windows server 2008 service pack 2 (server core installation)","name":"Windows Server 2008 Service Pack 2 (Server Core installation)","label":"windows server 2008 service pack 2 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.0.6003.0, < 6.0.6003.21218","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.0.6003.0, < 6.0.6003.21218","eol":null,"hubHref":"/vendor/microsoft/windows_server_2008_service_pack_2_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2012","name":"windows server 2012","label":"windows_server_2012","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 6.2.9200.0, < 6.2.9200.23462","noFixRecorded":false,"fixedIn":null},{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.2.9200.0, < 6.2.9200.23462 | na","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012"},{"vendor":"microsoft","product":"windows server 2012 r2","name":"Windows Server 2012 R2","label":"windows server 2012 r2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.3.9600.0, < 6.3.9600.20120","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.3.9600.0, < 6.3.9600.20120","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_r2"},{"vendor":"microsoft","product":"windows server 2012 r2 (server core installation)","name":"Windows Server 2012 R2 (Server Core installation)","label":"windows server 2012 r2 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.3.9600.0, < 6.3.9600.20120","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.3.9600.0, < 6.3.9600.20120","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_r2_server_core_installation"},{"vendor":"microsoft","product":"windows server 2012 (server core installation)","name":"Windows Server 2012 (Server Core installation)","label":"windows server 2012 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 6.2.9200.0, < 6.2.9200.23462","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 6.2.9200.0, < 6.2.9200.23462","eol":null,"hubHref":"/vendor/microsoft/windows_server_2012_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2016","name":"windows server 2016","label":"windows_server_2016","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.14393.0, < 10.0.14393.4651","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.14393.4651","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.14393.0, < 10.0.14393.4651 | < 10.0.14393.4651","eol":null,"hubHref":"/vendor/microsoft/windows_server_2016"},{"vendor":"microsoft","product":"windows server 2016 (server core installation)","name":"Windows Server 2016 (Server Core installation)","label":"windows server 2016 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.14393.0, < 10.0.14393.4651","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.14393.0, < 10.0.14393.4651","eol":null,"hubHref":"/vendor/microsoft/windows_server_2016_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2019","name":"windows server 2019","label":"windows_server_2019","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.17763.0, < 10.0.17763.2183","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.17763.2183","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.17763.0, < 10.0.17763.2183 | < 10.0.17763.2183","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)","name":"Windows Server 2019 (Server Core installation)","label":"windows server 2019 (server core installation)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.17763.0, < 10.0.17763.2183","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.17763.0, < 10.0.17763.2183","eol":null,"hubHref":"/vendor/microsoft/windows_server_2019_server_core_installation"},{"vendor":"microsoft","product":"windows_server_2022","name":"windows server 2022","label":"windows_server_2022","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.20348.0, < 10.0.20348.230","noFixRecorded":false,"fixedIn":null},{"text":"< 10.0.20348.230","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.20348.0, < 10.0.20348.230 | < 10.0.20348.230","eol":null,"hubHref":"/vendor/microsoft/windows_server_2022"},{"vendor":"microsoft","product":"windows_server_20h2","name":"windows server 20h2","label":"windows_server_20h2","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 10.0.19042.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 10.0.19042.1237","eol":null,"hubHref":"/vendor/microsoft/windows_server_20h2"},{"vendor":"microsoft","product":"windows server version 2004","name":"Windows Server version 2004","label":"windows server version 2004","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19041.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19041.1237","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_2004"},{"vendor":"microsoft","product":"windows server version 20h2","name":"Windows Server version 20H2","label":"windows server version 20h2","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 10.0.0, < 10.0.19042.1237","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.0.0, < 10.0.19042.1237","eol":null,"hubHref":"/vendor/microsoft/windows_server_version_20h2"}],"affectedCount":36,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444","label":"msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444","hostname":"msrc.microsoft.com","tags":["Vendor Advisory","Patch"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40444","label":"portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40444","hostname":"portal.msrc.microsoft.com","tags":["X Refsource MISC","X Transferred","Mitigation","Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/164210/Microsoft-Windows-MSHTML-Overview.html","label":"packetstormsecurity.com/files/164210/Microsoft-Windows-MSHTML-Overview.html","hostname":"packetstormsecurity.com","tags":["X Refsource MISC","X Transferred","Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/165214/Microsoft-Office-Word-MSHTML-Remote-Code-Execution.html","label":"packetstormsecurity.com/files/165214/Microsoft-Office-Word-MSHTML-Remote-Code-Execution.html","hostname":"packetstormsecurity.com","tags":["X Refsource MISC","X Transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/167317/Microsoft-Office-MSDT-Follina-Proof-Of-Concept.html","label":"packetstormsecurity.com/files/167317/Microsoft-Office-MSDT-Follina-Proof-Of-Concept.html","hostname":"packetstormsecurity.com","tags":["X Refsource MISC","X Transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40444","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40444","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:12022-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:12022-1"]},"timeline":[{"kind":"published","date":"2021-09-15T11:24:26.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2021-11-03T00:00:00.000Z","label":"Added to CISA KEV","detail":"Microsoft MSHTML Remote Code Execution Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2021-11-17T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2026-08-10T15:10:57.757Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":90,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T19:15:39.265Z","stale":false,"partial":false}}