CVE-2025-49697: Microsoft Office Remote Code Execution Vulnerability

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-07-08 · updated 2026-06-17
Weakness: CWE-122

Description

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected products

Microsoft 365 Apps: all versions
Microsoft 365 Copilot: all versions
Microsoft Office: 2016, 2019
Microsoft Office LTSC for Mac 2021: 2021, 2024
Microsoft Office Online Server: before 16.0.10417.20027 — fixed in 16.0.10417.20027
Microsoft 365 Apps: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office for Android: from 16.0.1 before 16.0.19029.20000 — fixed in 16.0.19029.20000
Microsoft Office LTSC 2021: from 16.0.1 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2024: from 16.0.0 before 16.99.25071321 — fixed in 16.99.25071321
Microsoft Office: from 16.0.0 before 16.0.5508.1001 — fixed in 16.0.5508.1001
Microsoft Office LTSC 2024: from 16.0.0 before https://aka.ms/OfficeSecurityReleases — fixed in https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021: from 16.0.1 before 16.99.25071321 — fixed in 16.99.25071321
Microsoft Office Online Server: from 16.0.0.0 before 16.0.10417.20027 — fixed in 16.0.10417.20027

How to fix

Upgrade to a fixed version: Microsoft Office Online Server 16.0.10417.20027; Microsoft 365 Apps https://aka.ms/OfficeSecurityReleases; Microsoft Office for Android 16.0.19029.20000; Microsoft Office LTSC 2021 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2024 16.99.25071321; Microsoft Office 16.0.5508.1001; Microsoft Office LTSC 2024 https://aka.ms/OfficeSecurityReleases; Microsoft Office LTSC for Mac 2021 16.99.25071321; Microsoft Office Online Server 16.0.10417.20027. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49697

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