Type Confusion Vulnerability in Windows Defender Firewall Service by Microsoft
CVE-2025-54109

6.7MEDIUM

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
9 September 2025

What is CVE-2025-54109?

The type confusion vulnerability in the Windows Defender Firewall Service enables an authorized attacker to exploit the service, resulting in potential privilege elevation. This vulnerability arises from improper resource access management, allowing malicious actors to leverage this flaw locally for unauthorized actions within the system.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.21128

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8422

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7792

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
6.7
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-54109 : Type Confusion Vulnerability in Windows Defender Firewall Service by Microsoft