For most people using a supported and fully updated Windows 11 computer, yes: Microsoft Defender Antivirus and the other protections inside Windows Security are sufficient as the primary antivirus.

A patch Microsoft released on Wednesday to fix a zero-day vulnerability in its Defender security engine may cause Windows machines to write files large enough to completely consume available disk ...

Microsoft on Wednesday morning issued an emergency update to its Microsoft Malware Protection Engine, closing CVE-2026-50656 — the Windows Defender privilege-escalation flaw known as RoguePlanet — 29 ...

Windows administrators face a hard, irreversible deadline in three days: when July 14's cumulative update installs, Microsoft permanently removes the registry key that allowed domain controllers to ...

Learn how BitLocker, passkeys, Microsoft Defender, and other Windows 11 security features protect your data, accounts, apps, and devices.

Microsoft Defender automatically isolated a compromised QNET endpoint in 129 seconds, stopping a multi-stage attack before the payload could persist or spread.

Microsoft says a new Defender capability isolated a compromised device and stopped a ransomware attack in 128 seconds.

Microsoft Defender engine 1.1.26060.3008 patches a critical SYSTEM privilege flaw but may expose Windows 11 to a new disk exhaustion attack via cached ADS files.

Managing business device security doesn't have to be complicated. Here's the easiest way to protect all your devices from one place.

The Hacker News is the top cybersecurity news platform, delivering real-time updates, threat intelligence, data breach ...

I built it from source and threw a misbehaving agent at it ...

If you’re experiencing High CPU and Disk usage from Avast Service on your Windows 11/10 PC, try the recommended solutions below in no particular order to see if the issue is resolved on your device.