Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability

HIGH 7.5EXPLOITED (CISA KEV)CVE-2021-33742 · Published 08/06/2021 · updated 17/06/2026

Microsoft Windows MSHTML Platform Remote Code Execution Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 03/11/2021. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

Windows MSHTML Platform Remote Code Execution Vulnerability

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742 · Patch
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2021-33742

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