Use After Free Vulnerability in Microsoft Office Excel
CVE-2025-59243

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
14 October 2025

What is CVE-2025-59243?

A vulnerability in Microsoft Office Excel allows an unauthorized attacker to exploit a use after free condition, potentially leading to the execution of arbitrary code locally. This could enable attackers to manipulate files or gain unauthorized access to sensitive information within Excel. Users of affected versions should apply the latest patches and security updates to mitigate risks associated with this vulnerability.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office LTSC 2021 x64-based Systems 16.0.1

Microsoft Office LTSC 2024 32-bit Systems 16.0.0

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-2025-59243 : Use After Free Vulnerability in Microsoft Office Excel