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+---- Thread: Microsoft Defender Antivirus security intelligence Sept. 2025 (/showthread.php?tid=21265)
Microsoft Defender Antivirus security intelligence Sept. 2025 - harlan4096 - 23 October 25
Quote:September-2025 (Platform: 4.18.25090.3009 | Engine: 1.1.25090.3001)What's new
- Security intelligence update version: 1.439.345.0
- Release date: September 8, 2025 (Engine) / September 21, 2025 (Platform)
- Platform: 4.18.25090.3009
- Engine: 1.1.25090.3001
- Support phase: Security and Critical Updates
- Improved service startup behavior: The core service now only restarts when necessary, for example, during a successful platform update. This change allows the organization to avoid unnecessary restarts when the service is already running correctly.
- Improved stability for RPC services: Added input validation across multiple RPC endpoints to prevent crashes caused by malformed data, which addresses a reported security vulnerability.
- Fixed threat exclusion handling: Resolved an issue where severity-based exclusions could cause the engine to misidentify threats, potentially skipping high severity detections.
- Restored performance optimization for network file access: Fixed a regression that caused slowdowns during file operations, like robocopy to network shares. The fix included reintroducing the logic to skip unnecessary checks on non-local files when Controlled Folder Access is enabled.