Use After Free Vulnerability in Microsoft Word by Microsoft
CVE-2025-59221

7HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Sharepoint Enterprise Server 2016
Microsoft Sharepoint Server 2019
Microsoft Office 2019
Microsoft 365 Apps For Enterprise
Vendor
CVE Published:
14 October 2025

What is CVE-2025-59221?

A vulnerability in Microsoft Word allows an unauthorized attacker to execute arbitrary code on a user's system due to a use after free condition. This flaw arises when the memory allocated for an object is deallocated but still referenced, leading to potential exploitation by malicious actors. Experts recommend updating to the latest version to mitigate risks associated with this security weakness.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office LTSC 2021 x64-based Systems 16.0.1

References

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

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-59221 : Use After Free Vulnerability in Microsoft Word by Microsoft