Use After Free Vulnerability in Microsoft Excel
CVE-2025-29977

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Office Online Server
Microsoft Office 2019
Microsoft 365 Apps For Enterprise
Microsoft Office Ltsc 2021
Vendor
CVE Published:
13 May 2025

What is CVE-2025-29977?

A vulnerability in Microsoft Office Excel enables unauthorized attackers to execute local code on affected systems due to a use after free condition. This flaw could be exploited to potentially gain control over the affected system. Users and administrators must apply recommended patches to secure their systems against 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 < 16.0.5500.1000

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

.
CVE-2025-29977 : Use After Free Vulnerability in Microsoft Excel