Endpoint Protection 14.3 Build 558 2021 | Symantec

Understanding the support lifecycle for SEP 14.3 Build 558 is essential for risk management and upgrade planning:

For organizations planning to deploy SEP 14.3 Build 558, the following system requirements apply:

Symantec Endpoint Protection (SEP) version 14.3 RU1 (Build 558) is a legacy maintenance release of the security suite. As of early 2026, the current stable version is , which was released on March 2, 2026. 🛡️ Core Management Tasks

When an application invokes an active script, AMSI requests a verdict from the SEP agent. If malicious traits are flagged, execution drops instantly, throwing an notification on the endpoint. Key Features and Enhancements

Detailed installation guidelines and build-specific fixes for this version can be found on the Broadcom Support Portal . symantec endpoint protection 14.3 build 558

A new policy setting allowed granular control over USB devices based on serial numbers and device classes, improving defenses against air-gap jumps via infected removable media.

Given these lifecycle constraints, organizations currently running SEP 14.3 Build 558 should consider upgrading to a more recent release (e.g., 14.3 RU9 or RU10) to maintain security coverage and support eligibility.

Fixes errors when exporting client installation packages via the SEPM Web Console. Streamlines large-scale deployment workflows.

Symantec Endpoint Protection OS | Specs, reviews and EoL info Understanding the support lifecycle for SEP 14

Do you use an or the Symantec Cloud Hybrid console ?

Build 558 was designed to bridge the gap between traditional on-premises management and the increasingly cloud-first world of enterprise IT. Its most notable features and improvements included: 1. Enhanced Cloud Management and Integration

The SEPM console and its associated remote consoles moved from Java 8 to , ensuring faster dashboard rendering, improved TLS compliance, and a hardened administrative surface. External logging structures also received automatic failover paths to preserve audit trails during network outages. Technical Specifications & Installation Requirements

: Isolating the scanning engine stabilizes memory footprints during scheduled system-wide scans. If malicious traits are flagged, execution drops instantly,

A major focus of Build 558 is reducing the resource footprint on endpoints.

Introduced a completely new Symantec Mac Agent with behavioral protection (SONAR) and URL reputation filtering.

: Verify port 443 (HTTPS) and port 8014 (HTTP) are open between the endpoint and the SEPM server. Use the SylinkDrop tool to re-import a fresh Sylink.xml communication file to restore the connection link. High CPU Usage by ccSvcHst.exe