一、情况分析
MSHTML（又称Trident）是微软Windows操作系统Internet Explorer（IE）浏览器的排版组件。软件开发人员使用该组件，可以在应用中快速实现网页浏览功能。MSHTML除应用于IE浏览器、IE内核浏览器外，还在Office的Word、Excel和PowerPoint文档中用来呈现Web托管内容。
9月7日，微软公司发布了针对Microsoft MSHTML远程代码执行漏洞的紧急安全公告。攻击者利用该漏洞，通过精心构造包含可被加载的恶意 ActiveX控件的Microsoft Office文件，并诱导受害者打开文档，从而触发此漏洞。未经身份验证的攻击者利用该漏洞，可获得受害者的当前用户权限，以该用户权限执行任意代码。
CNVD对该漏洞的综合评级为“高危”。
二、影响范围
漏洞影响的产品版本包括：
Windows 7 for x64-based Systems Service Pack 1
Windows 7 for 32-bit Systems Service Pack 1
Windows Server 2012 R2 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 (Server Core installation)
Windows Server 2012
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows RT 8.1
Windows 8.1 for x64-based systems
Windows 8.1 for 32-bit systems
Windows Server 2016 (Server Core installation)
Windows Server 2016
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 for 32-bit Systems
Windows Server, version 20H2 (Server Core Installation)
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for x64-based Systems
Windows Server, version 2004 (Server Core installation)
Windows 10 Version 2004 for x64-based Systems
Windows 10 Version 2004 for ARM64-based Systems
Windows 10 Version 2004 for 32-bit Systems
Windows Server 2022 (Server Core installation)
Windows Server 2022
Windows 10 Version 21H1 for 32-bit Systems
Windows 10 Version 21H1 for ARM64-based Systems
Windows 10 Version 21H1 for x64-based Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 1909 for 32-bit Systems
Windows Server 2019 (Server Core installation)
Windows Server 2019
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
三、处置建议
目前，微软公司暂未发布补丁程序修复该漏洞。CNVD建议受影响用户谨慎访问来源不明的Office文件或网页链接，具备一定专业知识的用户可通过更改注册表配置禁用ActiveX控件（建议操作前先做备份），并及时关注厂商的更新公告。
附：参考链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444
https://www.bleepingcomputer.com/news/security/microsoft-shares-temp-fix-for-ongoing-office-365-zero-day-attacks/
