Windows Defender Firewall Service Vulnerability Lets Attackers Disclose Sensitive Data

Microsoft has disclosed a critical security vulnerability in the Windows Defender Firewall Service that could allow attackers with elevated privileges to access sensitive system information.

Tracked as CVE-2025-62468, the vulnerability was publicly released on December 9, 2025, and has been assigned an “Important” severity rating by Microsoft.

The vulnerability stems from an out-of-bounds read flaw within the Windows Defender Firewall Service, classified under CWE-125.

This weakness enables authenticated attackers with high-level privileges to exploit the service and retrieve confidential information from the affected system without requiring user interaction.

The attack operates at the local level, meaning the attacker must have existing access to the target machine to execute the exploit.

According to Microsoft’s initial assessment, the vulnerability has not been publicly exploited in the wild, nor has proof-of-concept code been released.

The company remains confident that the vulnerability has been confirmed, but it has not yet been proven to be actively exploited.

Microsoft has already released an official security patch to address this issue, providing organizations with a clear remediation pathway.

The out-of-bounds read vulnerability poses a significant information-disclosure risk in enterprise environments that rely heavily on Windows Defender Firewall for network security.

While the vulnerability requires high privileges to exploit, it could serve as a secondary attack vector in multi-stage compromise scenarios where attackers have already obtained administrative credentials or bypassed initial security controls.

Organizations running vulnerable versions of Windows are urged to prioritize applying Microsoft’s latest security updates immediately.

The patch addresses this specific flaw while maintaining system stability and firewall functionality. IT administrators should assess their Windows infrastructure for exposure and implement the official fix across all affected systems.

This disclosure underscores the importance of maintaining up-to-date patch levels and enforcing strict privilege management controls across corporate networks.

Additionally, organizations should review access logs and monitor for suspicious activity targeting the Windows Defender Firewall Service, which could indicate exploitation attempts.

Vulnerability Details

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