windows defender firewall

Microsoft flagged a new information‑disclosure bug in the Windows Defender Firewall Service — tracked as CVE‑2025‑62468 — describing an out‑of‑bounds read that can allow an authorized local actor to disclose sensitive memory, and it appears in Microsoft’s December 9, 2025 security rollup...

Windows 11’s built‑in firewall remains the single most effective host‑level control for stopping unsolicited network access, and the eight practical steps in the provided guide distill what every user and admin should do to keep that first line of defense both effective and manageable...

Block specific apps’ network access with Windows Defender Firewall (Advanced Security) on Windows 10/11 Difficulty: Intermediate | Time Required: 20 minutes Introduction Blocking an app’s internet access can help protect your privacy, conserve bandwidth, or prevent a troublesome program from...

For years the reflex was simple: buy a third‑party antivirus suite and assume you were safer — but the calculus has shifted. A growing number of users and reviewers now say you can reasonably ditch paid antivirus software and rely on the built‑in protections in Windows Security (Microsoft...

CVE-2025-54109 Windows Defender Firewall Service Elevation of Privilege Vulnerability Summary What it is: CVE-2025-54109 is an elevation-of-privilege (EoP) vulnerability described by Microsoft as "Access of resource using incompatible type ('type confusion')" in the Windows Defender Firewall...

Microsoft’s security advisory for CVE-2025-54094 identifies a type‑confusion flaw in the Windows Defender Firewall Service that can be triggered by an authorized local actor to perform a local Elevation of Privilege (EoP) — in short, an attacker with the ability to run code as a non‑privileged...

Microsoft’s Security Update Guide records CVE-2025-54104 as an elevation of privilege vulnerability in the Windows Defender Firewall Service caused by an “access of resource using incompatible type (‘type confusion’)” — in short, a type‑confusion bug in a privileged service that an authorized...

Microsoft’s Security Update Guide lists CVE-2025-53808 as an Elevation of Privilege vulnerability in the Windows Defender Firewall Service that stems from an “access of resource using incompatible type” (commonly called type confusion), and the vendor warns that a locally authorized attacker...

If you manage servers, opening a port in the Windows Server firewall is one of those routine tasks that’s trivial to execute but easy to get wrong — and a single misconfiguration can expose services to the public internet. This feature explains the exact, supported ways to open ports in Windows...

The internet can be likened to an enormous digital playground—a bustling hub of information exchange and collaboration. But like any playground, it has its fair share of bullies: hackers, malicious software, and network vulnerabilities ready to exploit an unprotected PC. Enter the trusty Windows...

Microsoft Defender Firewall is a vital security feature within the Windows ecosystem, designed to protect your PC and network from unauthorized access. The firewall acts like a digital bouncer, blocking unwanted traffic and letting in only what you approve—adding significant layers of...

As Windows 11 continues to evolve as a robust operating system, its built-in features are becoming more sophisticated and user-friendly. One such essential feature is the Microsoft Defender Firewall, housed within the Windows Security app. Designed to protect your PC from unwanted intrusions...