Serial Microsoft zero-day leaker NightmareEclipse has found another way to mess with Windows Defender, this time by stopping ...

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

BigDiskBuster zero-day PoC stops Microsoft Defender updates by filling disk space; and unfortunately, no patch exists yet.

BigDiskBuster can block Microsoft Defender updates by filling disk space, leaving detection content stale; no patch or advisory exists.

Microsoft has fixed the bug that made Windows Security wrongly claim Microsoft Defender Antivirus was turned off. According ...

After installing the latest Defender Antivirus update for Windows 11, users have started reporting that their operating system is sending notifications stating "Microsoft Defender Antivirus is turned ...