6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
7.3 High
AI Score
Confidence
High
0.968 High
EPSS
Percentile
99.7%
<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>
Vendor | Product | Version | CPE |
---|---|---|---|
microsoft | windows_10_1809 | * | cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* |
microsoft | windows_server_2019 | * | cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
microsoft | windows_server_2019 | * | cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
microsoft | windows_10_1909 | * | cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* |
microsoft | windows_10_21h1 | * | cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* |
microsoft | windows_server_2022 | * | cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* |
microsoft | windows_10_2004 | * | cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* |
microsoft | windows_server_version_2004 | * | cpe:2.3:o:microsoft:windows_server_version_2004:*:*:*:*:*:*:*:* |
microsoft | windows_10_20h2 | * | cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:* |
microsoft | windows_server_20h2 | * | cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:* |
[
{
"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"
}
]
}
]
packetstormsecurity.com/files/164210/Microsoft-Windows-MSHTML-Overview.html
packetstormsecurity.com/files/165214/Microsoft-Office-Word-MSHTML-Remote-Code-Execution.html
packetstormsecurity.com/files/167317/Microsoft-Office-MSDT-Follina-Proof-Of-Concept.html
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40444
More
6.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L
7.3 High
AI Score
Confidence
High
0.968 High
EPSS
Percentile
99.7%