Remote code execution in Microsoft Internet Explorer

Published: 2021-02-07 | Updated: 2021-11-18
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-26411
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 09.03.2021

Added CVE-ID, bulletin status changed to patched.

1) Double Free

EUVDB-ID: #VU50401

Risk: Critical


CVE-ID: CVE-2021-26411


Exploit availability:


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing ".mht" files. A remote attacker can trick the victim to visit a specially crafted webpage, trigger a double free error and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.


Install update from vendor's website.

Vulnerable software versions

Microsoft Internet Explorer: 9 - 11

Fixed software versions

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?