Vulnerability identifier: #VU58926

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-43255

CWE-ID: CWE-451

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Microsoft Office
Client/Desktop applications / Office applications
Microsoft 365 Apps for Enterprise
Client/Desktop applications / Office applications
Microsoft Office LTSC 2021
Other software / Other software solutions

Vendor: Microsoft

Description

The vulnerability allows a local attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in Microsoft Office Trust Center. A local attacker can spoof page content.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2019, 2013 - 2013 Service Pack 1

Microsoft 365 Apps for Enterprise:

Microsoft Office LTSC 2021: 32 bit editions - 64 bit editions

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43255

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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