Remote code execution in Windows MSHTML Platform



Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-33742
CWE-ID CWE-119
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
 Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Microsoft Internet Explorer
Client/Desktop applications / Web browsers

Microsoft Edge
Client/Desktop applications / Web browsers

Vendor Microsoft

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Buffer overflow

EUVDB-ID: #VU53897

Risk: Critical

CVSSv3.1: 8.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-33742

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing HTML content within Windows MSHTML Platform. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7 - 10

Windows Server: 2008 R2 - 2019 10.0.17763.1

Microsoft Internet Explorer: 11

Microsoft Edge: All versions

CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33742


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.



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