title: Microsoft MSHTML Remote Code Execution Vulnerability
description: <p>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.</p>
<p>An 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.</p>
<p>Microsoft 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”.</p>
<p>Upon 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.</p>
<p>Please see the <strong>Mitigations</strong> and <strong>Workaround</strong> sections for important information about steps you can take to protect your system from this vulnerability.</p>
<p><strong>UPDATE</strong> 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.</p>
problem types: Remote Code Execution
affected:
{
vendor: Microsoft
product: Windows 10 Version 1809
cpes: [cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2183:*:*:*:*:*:arm64:*]
platforms: [32-bit Systems, x64-based Systems, ARM64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.17763.2183, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2019
cpes: cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.17763.2183, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2019 (Server Core installation)
cpes: cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2183:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.17763.2183, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 1909
cpes: [cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1801:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1801:*:*:*:*:*:x64:*]
platforms: [32-bit Systems, x64-based Systems, ARM64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.18363.1801, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 21H1
cpes: [cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:arm64:*, cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1237:*:*:*:*:*:x86:*]
platforms: [x64-based Systems, ARM64-based Systems, 32-bit Systems]
versions:
version: 10.0.0, lessThan: 10.0.19043.1237, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2022
cpes: cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.230:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.20348.230, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 2004
cpes: cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1237:*:*:*:*:*:x64:*
platforms: [32-bit Systems, ARM64-based Systems, x64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.19041.1237, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server version 2004
cpes: cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1237:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.19041.1237, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 20H2
cpes: [cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1237:*:*:*:*:*:arm64:*]
platforms: [32-bit Systems, ARM64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.19042.1237, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server version 20H2
cpes: cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1237:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.19042.1237, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 1507
cpes: [cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19060:*:*:*:*:*:x64:*]
platforms: [32-bit Systems, x64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.10240.19060, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 10 Version 1607
cpes: [cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4651:*:*:*:*:*:x64:*]
platforms: [32-bit Systems, x64-based Systems]
versions:
version: 10.0.0, lessThan: 10.0.14393.4651, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2016
cpes: cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.14393.4651, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2016 (Server Core installation)
cpes: cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4651:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 10.0.0, lessThan: 10.0.14393.4651, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 7
cpes: [cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x86:*]
platforms: 32-bit Systems
versions:
version: 6.1.0, lessThan: 6.1.7601.25712, versionType: custom, status: affected
version: 6.1.0, lessThan: 1.001, versionType: custom, status: affected
version: 6.1.0, lessThan: 6.1.7601.26221, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 7 Service Pack 1
cpes: [cpe:2.3:o:microsoft:windows_7:6.1.7601.25712:sp1:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_7:1.001:sp1:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_7:6.1.7601.26221:sp1:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.1.0, lessThan: 6.1.7601.25712, versionType: custom, status: affected
version: 6.1.0, lessThan: 1.001, versionType: custom, status: affected
version: 6.1.0, lessThan: 6.1.7601.26221, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows 8.1
cpes: [cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20120:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_8.1:1.001:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20120:*:*:*:*:*:*:*]
platforms: [32-bit Systems, x64-based Systems, ARM64-based Systems]
versions:
version: 6.3.0, lessThan: 6.3.9600.20120, versionType: custom, status: affected
version: 6.3.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2008 Service Pack 2
cpes: [cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*]
platforms: 32-bit Systems
versions:
version: 6.0.0, lessThan: 6.0.6003.21218, versionType: custom, status: affected
version: 6.0.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2008 Service Pack 2 (Server Core installation)
cpes: [cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*]
platforms: [32-bit Systems, x64-based Systems]
versions:
version: 6.0.0, lessThan: 6.0.6003.21218, versionType: custom, status: affected
version: 6.0.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2008  Service Pack 2
cpes: [cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21218:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_server_2008_sp2:1.001:*:*:*:*:*:x86:*]
platforms: x64-based Systems
versions:
version: 6.0.0, lessThan: 6.0.6003.21218, versionType: custom, status: affected
version: 6.0.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2008 R2 Service Pack 1
cpes: [cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.1.0, lessThan: 6.1.7601.25712, versionType: custom, status: affected
version: 6.1.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2008 R2 Service Pack 1 (Server Core installation)
cpes: [cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25712:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2008_R2:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.0.0, lessThan: 6.1.7601.25712, versionType: custom, status: affected
version: 6.0.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2012
cpes: [cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.2.0, lessThan: 6.2.9200.23462, versionType: custom, status: affected
version: 6.2.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2012 (Server Core installation)
cpes: [cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23462:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2012:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.2.0, lessThan: 6.2.9200.23462, versionType: custom, status: affected
version: 6.2.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2012 R2
cpes: [cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.3.0, lessThan: 6.3.9600.20120, versionType: custom, status: affected
version: 6.3.0, lessThan: 1.001, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Windows Server 2012 R2 (Server Core installation)
cpes: [cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20120:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_server_2012_R2:1.001:*:*:*:*:*:x64:*]
platforms: x64-based Systems
versions:
version: 6.3.0, lessThan: 6.3.9600.20120, versionType: custom, status: affected
version: 6.3.0, lessThan: 1.001, versionType: custom, status: affected
}
metrics:
format: CVSS
scenarios: GENERAL
cvssV3_1: [
version: 3.1
baseSeverity: HIGH
baseScore: 8.8
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
]