Windows Defender Zero-Day Detection Bypass | MSSP Advisory

Microsoft patched two zero-day vulnerabilities in Windows Defender that attackers actively exploited before patches were available. The vulnerabilities affect Windows Defender's core scanning engine and allow attackers to bypass antivirus detection entirely. Microsoft confirmed active exploitation but provided limited technical details about the attack vectors.

Your RMM agents and endpoint management tools rely on Windows Defender as a baseline security layer across both your infrastructure and client environments. When Defender fails silently, your monitoring stack loses visibility into threats that should trigger alerts. Client environments running default Windows configurations are exposed to undetected malware until these patches deploy.

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