Use After Free Vulnerability in Microsoft Excel Software
CVE-2025-59223

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Office Online Server
Microsoft Office 2019
Microsoft 365 Apps For Enterprise
Microsoft Office Ltsc For Mac 2021
Vendor
CVE Published:
14 October 2025

What is CVE-2025-59223?

A use after free vulnerability exists in Microsoft Excel that allows an attacker to execute arbitrary code locally. This flaw can be exploited if a victim opens a specially crafted Excel file, leading to unauthorized access and potential manipulation of system operations. Keeping Excel updated is essential to mitigate risks associated with this vulnerability.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 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-2025-59223 : Use After Free Vulnerability in Microsoft Excel Software