Use After Free Vulnerability in Microsoft Office Software
CVE-2025-59227

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
14 October 2025

What is CVE-2025-59227?

A use after free vulnerability in Microsoft Office enables an unauthorized attacker to execute malicious code on a victim's machine. This weakness arises when the program inadvertently accesses previously freed memory, potentially allowing attackers to manipulate application behavior and carry out unauthorized actions. Organizations using affected versions are encouraged to update their software to mitigate this threat. For more details, visit the Microsoft advisory.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2016 x64-based Systems 16.0.0 < 16.0.5522.1000

Microsoft Office 2019 32-bit Systems 19.0.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-59227 : Use After Free Vulnerability in Microsoft Office Software