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PoC public Windows Defender zero-day Microsoft mobile

New Windows Defender zero-day blocks Microsoft antivirus updates

BleepingComputer·By Sergiu Gatlan··2 min read
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Researcher Abdelhamid Naceri released BigDiskBuster, a proof of concept that can prevent Windows Defender from receiving platform and signature updates on supported Windows versions while it runs in the background. The update-blocking issue has no CVE ID or vendor patch yet; it follows other Defender flaws, including ShieldBreak, tracked as CVE-2026-69414.

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