Windows Defender Firewall is the built-in Windows host firewall that filters inbound and outbound network traffic and is integrated with Microsoft Defender for Endpoint.
Overview
Windows Defender Firewall is the built-in Windows host firewall that filters inbound and outbound network traffic and is integrated with Microsoft Defender for Endpoint. It enforces rule-based access across profiles to prevent unauthorized connections and data exposure, making it a critical component of endpoint security; a recent flaw was reported that could allow attackers to access sensitive data on affected systems, underscoring the importance of timely patches and secure configurations.
Related Threat Clusters
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Critical Vulnerability in Windows Defender Firewall Exposes Sensitive Data
Microsoft has disclosed a critical vulnerability in the Windows Defender Firewall Service that allows attackers with elevated privileges to access sensitive data. This flaw poses significant risks to users relying on…
3 articles · Updated December 10, 2025
Recent Intelligence Reports
- Windows Defender Firewall Flaw Allows Attackers to Access Sensitive Data — Gbhackers · December 10, 2025