CVE-2021-33742 Microsoft Windows MSHTML Platform Remote Code Execution
An attacker can execute arbitrary code on Windows systems by exploiting a memory corruption vulnerability in the MSHTML platform.
- Exploited in the wild
- Since 3 Nov 2021
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-33742?
CVE-2021-33742 is a high-severity memory corruption vulnerability in Microsoft Windows 10 1507, published on 8 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Windows MSHTML Platform Remote Code Execution Vulnerability
Weakness: CWE-787
Which versions are affected by CVE-2021-33742?
It affects 14 products.
Products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 1909, Microsoft Windows 10 2004, Microsoft Windows 10 20h2 and 8 more.
How do I fix CVE-2021-33742?
No fix has been published for CVE-2021-33742 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Nov 2021.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-33742 being exploited?
Yes. Attackers have exploited CVE-2021-33742 in the wild since at least 3 Nov 2021.
Other vulnerabilities in Microsoft Windows 10 1507
- CVE-2017-8543 Microsoft Windows Search Remote Code Execution
- CVE-2025-33053 Microsoft Windows External Control of File Name or Path
- CVE-2025-33073 Microsoft Windows SMB Client Improper Access Control
- CVE-2024-49039 Microsoft Windows Task Scheduler Privilege Escalation
- CVE-2024-43461 Microsoft Windows MSHTML Platform Spoofing
Sources
Also known as GHSA-gf47-3hhj-gv96.