🔴 New Windows Defender zero-day blocks Microsoft antivirus updates

Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates.

Naceri named it BigDiskBuster and said it is similar to another Defender zero-day known as UnDefend, which he released in April and that allowed standard users to block definition updates.

The security researcher added that BigDiskBuster works on all supported Windows versions and that it needs to run in the background to block Defender updates.