#VU102795 Protection Mechanism Failure in Microsoft products - CVE-2025-21346

Vulnerability identifier: #VU102795

Vulnerability risk: High

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-21346

CWE-ID: CWE-693

Exploitation vector: Network

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
Client/Desktop applications / Other client software

Vendor: Microsoft

Description

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

The vulnerability exists due to insufficient implementation of security measures in Microsoft Office. A remote attacker can trick a victim to open a specially crafted file and bypass implemented security restrictions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft Office: 2016, 2019

Microsoft Office LTSC: 2021 - 2024

Microsoft 365 Apps for Enterprise: 32-bit Systems, 64-bit Systems

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21346

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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.