Heap-Based Buffer Overflow Vulnerability in Microsoft Office Excel
CVE-2025-54900

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:
9 September 2025

What is CVE-2025-54900?

A heap-based buffer overflow vulnerability exists in Microsoft Office Excel, which creates an opportunity for unauthorized attackers to execute arbitrary code locally. This flaw can be exploited by crafting malicious inputs that could lead to memory corruption, enabling the execution of unintended code. Users of affected versions are advised to apply necessary security updates and follow best practices to safeguard their systems.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 16.0.5517.1000

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-2025-54900 : Heap-Based Buffer Overflow Vulnerability in Microsoft Office Excel