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CVE-2025-21402: Microsoft Office OneNote Remote Code Execution Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-14 · updated 2026-06-17
• Weakness: CWE-641

Description

Microsoft Office OneNote Remote Code Execution Vulnerability

Affected products

• Microsoft Office: 2024
• Microsoft Office LTSC for Mac 2021: 2021
• Microsoft OneNote for Android: all versions
• Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.93.25011212 — fixed in 16.93.25011212
• Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.93.25011212 — fixed in 16.93.25011212
• Microsoft OneNote for Android: from 1.0.0 before 16.92.24120731 — fixed in 16.92.24120731

How to fix

Upgrade to a fixed version: Microsoft Office LTSC for Mac 2024 16.93.25011212; Microsoft Office LTSC for Mac 2021 16.93.25011212; Microsoft OneNote for Android 16.92.24120731. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21402

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