CVE-2021-33742 HIGH

CVE-2021-33742: Windows MSHTML Platform Remote Code Execution Vulnerability

Vendor Microsoft
Product Windows 10 Version 1809
KEV Status Known Exploited
Published June 8, 2021
Last update October 21, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Windows MSHTML Platform Remote Code Execution Vulnerability

CISA mandated remediation

02CISA Required Action

Apply updates per vendor instructions.

Key dates

03Disclosure timeline

June 8, 2021 CVE published
October 21, 2025 Record updated