Vulnerability identifier: #VU53914

Vulnerability risk: Medium

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-31971

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Windows Server
Operating systems & Components / Operating system
Windows
Operating systems & Components / Operating system
Microsoft Internet Explorer
Client/Desktop applications / Web browsers
Microsoft Edge
Client/Desktop applications / Web browsers

Vendor: Microsoft

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to Windows HTML Platform does not properly impose security restrictions. A remote attacker can create a specially crafted web page, trick the victim into opening it and bypass implemented security restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows Server: 2008 - 2019

Windows: 10 - 10 2004, 8.1 - 8.1 RT, 7

Microsoft Internet Explorer: 11

Microsoft Edge:

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31971

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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?

No. We are not aware of malware exploiting this vulnerability.