Yet the automatic update introduces a risk: single point of failure. If Microsoft’s cloud signature server is compromised or misconfigured (as seen in the 2021 false-positive incident where Defender flagged legitimate Chrome updates as malware), a billion machines are affected simultaneously. The very speed that enables Block-at-First-Sight also enables a supply-chain attack of unprecedented scale.
These improve the scanning technology itself and are usually bundled with security intelligence updates once a month. How to Update Manually microsoft defender antivirus update
Administrators should verify the "About" section in the Windows Security app or use PowerShell: Yet the automatic update introduces a risk: single
In critical incident response scenarios, waiting for the automatic poll interval is unacceptable. Administrators can force an immediate update via PowerShell: microsoft defender antivirus update