: Added browser intrusion prevention support for Edge, applying IPS signatures to inbound and outbound traffic.
Symantec Endpoint Protection (SEP) version 14.3.558.0000 was the initial release of the 14.3 series, launched on May 7, 2020 symantec endpoint protection 14.3 build 558
Build 558 is a maintenance and feature refinement release, not a major overhaul. But it brings several critical fixes, performance tweaks, and management enhancements that make it worth planning an upgrade. : Added browser intrusion prevention support for Edge,
The Windows client added support for Windows 10 version 2004 (20H1), while the Linux client expanded to include Ubuntu 18.04, RHEL 8, and CentOS 8. IPv6 Integration: The Windows client added support for Windows 10
Build 558 was the first build to fully integrate the "SEP Client" with the cloud management dashboard (though on-prem remains an option). The agent includes telemetry connectors that automatically forward file hash data to if deployed.
: This build allows third-party applications to call the Windows AMSI interface to request scans for dynamic script-based malware (e.g., PowerShell, JavaScript, VBScript).