#VU102657 Improper Restriction of Names for Files and Other Resources in Microsoft OneNote for Mac and Microsoft Office LTSC - CVE-2025-21402

Vulnerability identifier: #VU102657

Vulnerability risk: High

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-21402

CWE-ID: CWE-641

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Microsoft OneNote for Mac
Client/Desktop applications / Office applications
Microsoft Office LTSC
Client/Desktop applications / Other client software

Vendor: Microsoft

Description

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

The vulnerability exists due to improper restriction of names for files and other resources in Microsoft Office OneNote. A remote attacker can trick a victim to open a specially crafted file and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Microsoft OneNote for Mac: All versions

Microsoft Office LTSC: 2021 for Mac - 2024 for Mac

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2025-21402

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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.