Microsoft Defender Antivirus security intelligence November-2025

[harlan4096]

November-2025 (Platform: 4.18.25110.6 | Engine: 1.25110.1)

• Security intelligence update version: 1.443.6.0
  
• Release date: December 11, 2025 (Engine) / December 17, 2025 (Platform)
  
• Platform: 4.18.25110.6
  
• Engine: 1.1.25110.1
  
• Support phase: Security and Critical Updates
  

 What's new​

• Performance improvements when querying WMI due to Behavior Monitor detections.
  
• Fixed potential hang in PowerShell on Server 2016 due to Defender Filter Driver.
  
• Resolved an application compatibility issue due to a loopback with SMB1 enabled.
  
• Fixed issue with ASR path exclusion requiring additional "" characters to function appropriately.
  
• Resolved high I/O issue with NisSrv.exe due to high volume of network logging events.
  
• Fixed error in threat enumeration causing repeated failure notifications every 15 minutes in SCCM.
  
• Improved drive mapping enumeration for devices with many drives which resulted in false positive detections for ASR rules.
  
• Fixed a crash with Defender related to long scan times causing the service to hang in Windows Server 2019
  

Microsoft Defender Antivirus security intelligence and product updates - Microsoft Defender for Endpoint