Type Confusion Vulnerability in Microsoft Office Excel
CVE-2025-30383

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-2025-30383?

A type confusion vulnerability in Microsoft Office Excel permits unauthorized attackers to execute arbitrary code locally. This flaw arises from the improper handling of resources, leading to a scenario where an attacker can exploit the discrepancy in data types. Successful exploitation of this vulnerability could result in severe security issues, allowing attackers to gain unauthorized access to system resources.

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-2025-30383 : Type Confusion Vulnerability in Microsoft Office Excel