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CVE-2021-34447— Windows MSHTML Platform Remote Code Execution Vulnerability

Quick assessment

Affected

Microsoft Windows 10 Version 1507

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows MSHTML Platform是美国微软（Microsoft）公司的一个应用程序。 microsoft Windows MSHTML Platform存在代码注入漏洞。以下产品和版本受到影响：Windows 10 Version 21H1 for x64-based Systems,Windows 10 Version 21H1 for ARM64-based Systems,Windows 10 Version 21H1 for 32-bit Systems,Wind

CVSS 6.8 · Medium EPSS 2.04% · P79 Updated Aug 10, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

Vendor	Product	Version Range	Status
Microsoft	Windows 10 Version 1507	`10.0.10240.0< 10.0.10240.19003`	affected
Microsoft	Windows 10 Version 1607	`10.0.14393.0< 10.0.14393.4530`	affected
Microsoft	Windows 10 Version 1809	`10.0.17763.0< 10.0.17763.2061`	affected
		`10.0.0< 10.0.17763.2061`	affected
Microsoft	Windows 10 Version 1909	`10.0.0< 10.0.18363.1679`	affected
Microsoft	Windows 10 Version 2004	`10.0.0< 10.0.19041.1110`	affected
Microsoft	Windows 10 Version 20H2	`10.0.0< 10.0.19042.1110`	affected
Microsoft	Windows 10 Version 21H1	`10.0.0< 10.0.19043.1110`	affected
Microsoft	Windows 7	`6.1.0< 6.1.7601.25661`	affected
Microsoft	Windows 7 Service Pack 1	`6.1.0< 6.1.7601.25661`	affected
Microsoft	Windows 8.1	`6.3.0< 6.3.9600.20069`	affected
Microsoft	Windows Server 2008 R2 Service Pack 1	`6.1.7601.0< 6.1.7601.25661`	affected
Microsoft	Windows Server 2008 Service Pack 2	`6.0.6003.0< 6.0.6003.21167`	affected
Microsoft	Windows Server 2008 Service Pack 2 (Server Core installation)	`6.0.6003.0< 6.0.6003.21167`	affected
Microsoft	Windows Server 2012	`6.2.9200.0< 6.2.9200.23409`	affected
Microsoft	Windows Server 2012 R2	`6.3.9600.0< 6.3.9600.20069`	affected
Microsoft	Windows Server 2016	`10.0.14393.0< 10.0.14393.4530`	affected
Microsoft	Windows Server 2019	`10.0.17763.0< 10.0.17763.2061`	affected

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I. Basic Information for CVE-2021-34447

Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

Windows MSHTML Platform Remote Code Execution Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

Windows MSHTML Platform Remote Code Execution Vulnerability

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Microsoft Windows MSHTML Platform 代码注入漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Microsoft	Windows 10 Version 1507	10.0.10240.0 ~ 10.0.10240.19003	-
Microsoft	Windows 10 Version 1607	10.0.14393.0 ~ 10.0.14393.4530	-
Microsoft	Windows 10 Version 1809	10.0.17763.0 ~ 10.0.17763.2061	-
Microsoft	Windows 10 Version 1809	10.0.0 ~ 10.0.17763.2061	-
Microsoft	Windows 10 Version 1909	10.0.0 ~ 10.0.18363.1679	-
Microsoft	Windows 10 Version 2004	10.0.0 ~ 10.0.19041.1110	-
Microsoft	Windows 10 Version 20H2	10.0.0 ~ 10.0.19042.1110	-
Microsoft	Windows 10 Version 21H1	10.0.0 ~ 10.0.19043.1110	-
Microsoft	Windows 7	6.1.0 ~ 6.1.7601.25661	-
Microsoft	Windows 7 Service Pack 1	6.1.0 ~ 6.1.7601.25661	-
Microsoft	Windows 8.1	6.3.0 ~ 6.3.9600.20069	-
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.7601.0 ~ 6.1.7601.25661	-
Microsoft	Windows Server 2008 Service Pack 2	6.0.6003.0 ~ 6.0.6003.21167	-
Microsoft	Windows Server 2008 Service Pack 2 (Server Core installation)	6.0.6003.0 ~ 6.0.6003.21167	-
Microsoft	Windows Server 2012	6.2.9200.0 ~ 6.2.9200.23409	-
Microsoft	Windows Server 2012 R2	6.3.9600.0 ~ 6.3.9600.20069	-
Microsoft	Windows Server 2016	10.0.14393.0 ~ 10.0.14393.4530	-
Microsoft	Windows Server 2019	10.0.17763.0 ~ 10.0.17763.2061	-

II. Public POCs for CVE-2021-34447

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2021-34447

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-34447 (2)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34447 x_refsource_MISC
🔗 🔃 Security Update Guide - Loading - Microsoft vendor-advisory patch

https://www.cve.org/CVERecord?id=CVE-2021-34447

Same Patch Batch · Microsoft · 2021-07-16 · 27 CVEs total

CVE-2021-34458	9.9 CRITICAL	Windows Kernel Remote Code Execution Vulnerability
CVE-2021-34442	8.8 HIGH	Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-34481	8.8 HIGH	Windows Print Spooler Remote Code Execution Vulnerability
CVE-2021-34450	8.5 HIGH	Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-34446	8.0 HIGH	Windows HTML Platforms Security Feature Bypass Vulnerability
CVE-2021-34452	7.8 HIGH	Microsoft Word Remote Code Execution Vulnerability
CVE-2021-34438	7.8 HIGH	Windows Font Driver Host Remote Code Execution Vulnerability
CVE-2021-34439	7.8 HIGH	Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34441	7.8 HIGH	Microsoft Windows Media Foundation Remote Code Execution Vulnerability
CVE-2021-34445	7.8 HIGH	Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-34455	7.8 HIGH	Windows File History Service Elevation of Privilege Vulnerability
CVE-2021-34456	7.8 HIGH	Windows Remote Access Connection Manager Elevation of Privilege Vulnerability
CVE-2021-34459	7.8 HIGH	Windows AppContainer Elevation Of Privilege Vulnerability
CVE-2021-34460	7.8 HIGH	Windows Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-34461	7.8 HIGH	Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
CVE-2021-34464	7.8 HIGH	Microsoft Defender Remote Code Execution Vulnerability
CVE-2021-34467	7.1 HIGH	Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-34449	7.0 HIGH	Win32k Elevation of Privilege Vulnerability
CVE-2021-34462	7.0 HIGH	Windows AppX Deployment Extensions Elevation of Privilege Vulnerability
CVE-2021-34448	6.8 MEDIUM	Scripting Engine Memory Corruption Vulnerability

Showing top 20 of 27 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1507

Same vendor: Microsoft

V. Comments for CVE-2021-34447

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2021-34447— Windows MSHTML Platform Remote Code Execution Vulnerability

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 18

I. Basic Information for CVE-2021-34447

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2021-34447

III. Intelligence Information for CVE-2021-34447

Vendor Advisories for CVE-2021-34447 (2)

Same Patch Batch · Microsoft · 2021-07-16 · 27 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2021-34447

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