CVE-2021-33742
Windows MSHTML Platform Remote Code Execution Vulnerability
Vexday Risk Score
63High priority
SSVC decision (CISA)
Act
Exploitation + impact → act immediately
CVSS 7.5EPSS 59.1%KEV simPoC —Patch —
Lifecycle
08 Jun 2021Published on NVD
03 Nov 2021Active exploitation (CISA KEV)
Recommendation: Patch as soon as possible — active exploitation confirmed.
In short
A flaw in Windows MSHTML (Internet Explorer's rendering engine) allows attackers to execute arbitrary code on a victim's computer through a specially crafted webpage. This is dangerous because simply visiting a malicious website could compromise your entire system.
Technical detail
Out-of-bounds write vulnerability (CWE-787) in MSHTML engine exploitable via malicious HTML/JavaScript content delivered through web browser. Requires user interaction (visiting malicious page); successful exploitation leads to arbitrary code execution with user privileges.
Summary generated and translated by AI from the official description.
Windows MSHTML Platform Remote Code Execution Vulnerability
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Affected products
Microsoft · Windows 10 Version 1507Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 1909Microsoft · Windows 10 Version 2004Microsoft · Windows 10 Version 20H2Microsoft · Windows 10 Version 21H1Microsoft · Windows 7Microsoft · Windows 7 Service Pack 1Microsoft · Windows 8.1Microsoft · Windows Server 2008 R2 Service Pack 1Microsoft · Windows Server 2008 Service Pack 2Microsoft · Windows Server 2008 Service Pack 2Microsoft · Windows Server 2012Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2016Microsoft · Windows Server 2019Want to know if your infrastructure is exposed to this?
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