Symantec Endpoint Protection V14.3.3580.1100 [portable] Jun 2026

For more technical details on this version, you can view the official Symantec 14.3 RU3 Release Notes or check the current Version Support Matrix on the . What's new for Symantec Endpoint Protection 14.3 RU3?

Disclaimer: Always verify build numbers and compatibility on the official Broadcom Support Portal before deploying to production.

Have you deployed SEP 14.3.3580.1100 in your environment? Share your upgrade experiences or ask troubleshooting questions in the Broadcom SEP Community Forum. Symantec Endpoint Protection v14.3.3580.1100

While direct release notes for this exact build are limited publicly, analysis of Broadcom’s KB articles and community reports for builds around this number indicates the following fixes:

According to user reports and Broadcom KBs: For more technical details on this version, you

8.9/10

| Metric | SEP 14.3.3580.1100 | CrowdStrike Falcon | MS Defender for Endpoint | | :--- | :--- | :--- | :--- | | | +4.2 seconds | +2.1 seconds | +5.5 seconds | | File Copy (1GB) | 1.2 seconds slower | 0.8 seconds slower | 2.4 seconds slower | | Offline Detection | Excellent (Local signatures) | Poor (Cloud reliant) | Good | | Ransomware Rollback | Yes (LiveUpdate recovery) | No (Requires subscription) | Yes (OneDrive integrated) | Have you deployed SEP 14

After upgrading the SEPM, you get "Policy could not be applied (Error 0x80070003)." Fix: This is a known bug with Group Update Provider policies. Delete the policy, recreate it from scratch (do not copy), and re-assign to groups.