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Rewterz Threat Advisory – Microsoft MSHTML Remote Code Execution Vulnerability

Severity

High

Analysis Summary

CVE-2021-40444

An attacker could craft a malicious ActiveX control to be used by a Microsoft Office document that hosts the browser rendering engine. The attacker would then have to convince the user to open the malicious document. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Impact

  • Remote Code Execution

Affected Vendors

  • Microsoft

Affected Products

  • MSHTML

Remediation

Microsoft is yet to release a patch for the vulnerability however, Disabling the installation of all ActiveX controls in Internet Explorer mitigates this attack.

More details can be found at:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444