558: Symantec Endpoint Protection 14.3 Build

Before installing, understand the hierarchy:

Build 558 patches three privilege escalation vulnerabilities in the management console (CVSS scores ranging 7.1 to 8.2). Administrators using older builds (14.3 RU4 or lower) are exposed to these exploits if the SEPM is internet-facing.

Notably fixed: An issue where a low-privileged user could extract hash dumps from the client’s quarantine folder via a symbolic link attack.

Registered customers can download the bits via the Broadcom Support Portal:

Checksum (Windows 64-bit Full Installer): SHA-256: 4A8B9C2D... (Verify before deployment).

You must install the client software on user machines.

Consult the official Symantec release notes and product documentation for exact build-specific fixes, CVE references, and the supported platform matrix.

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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

. This build introduced several architectural changes, including a shift toward cloud-based management features and updated platform support. Broadcom TechDocs Core Documentation & Resources

For technical details specific to this build, you can refer to the following official types of documentation: Release Notes for SEP 14.3

: This is the definitive "paper" for build 558. It outlines new features like Windows 10 version 2004 support and the removal of legacy features. Versions & Build Numbers Table

: Use this official Broadcom technical article to verify build 14.3.558.0000 against later updates like 14.3 MP1 or 14.3 RU1. Installation Guide

: Provides a step-by-step "Quick Start" for installing the Management Server and deploying clients. Broadcom support portal Key Technical Specifications for Build 558 Requirement / Feature Release Date May 7, 2020 OS Support Windows 10 (up to 20H1), Ubuntu 18.04, RHEL 8, CentOS 8 Memory (SEPM) 2 GB RAM minimum; 8 GB or more recommended Storage (SEPM) 40 GB minimum for local database installs Major Changes

Updated AppRemover tool; removal of CASMA tab; deprecation of older macOS support Important Lifecycle Note

While version 14.3.558 is still within its standard support window until December 31, 2025

, it has been superseded by many newer releases. If you are troubleshooting a specific issue, it is highly recommended to check for Client-Only Patches

that were released shortly after build 558 to address initial stability bugs. Broadcom Community white paper on security features, or do you need a specific technical guide for troubleshooting this build? Before installing, understand the hierarchy:

Symantec Endpoint Protection OS | Specs, reviews and EoL info

Symantec Endpoint Protection 14.3 Build 558 is not a revolutionary leap but rather a sophisticated refinement of a mature endpoint protection platform. It strikes an effective balance between proactive ML-driven detection and proven signature/behavioral methods. Its strengths lie in operational stability, low false positive rates, and robust offline defenses—qualities highly valued in regulated industries (finance, healthcare, government). While the user interface and certain management complexities remain dated, and the Broadcom acquisition has introduced friction, Build 558 nonetheless provides reliable layered security for organizations that prioritize control over cloud-everything architecture. For IT security teams managing thousands of endpoints across hybrid environments, this build offers a trustworthy, battle-tested solution that can withstand modern attack vectors without demanding a complete infrastructure overhaul.

In summary, SEP 14.3 Build 558 represents the culmination of Symantec’s pre-acquisition engineering ethos—deep integration, proactive defense, and enterprise-grade manageability—making it a worthy, albeit sometimes underappreciated, contender in the endpoint security market.

Symantec Endpoint Protection (SEP) version 14.3 (14.3.558.0000) is the initial release of the 14.3 branch, launched on May 5, 2020. This build introduced several architectural changes, including a unified agent and enhanced integration with cloud management consoles. Key Details for Build 14.3.558 Release Date: May 5, 2020.

Major Features: This release focused on performance improvements and the introduction of a more modular architecture to facilitate cloud management.

Security Advisory: Shortly after release, a security update (SYMSA1762) was issued to address specific vulnerabilities found in this build.

Upgrade Path: To provide content updates to 14.3.558 clients, the Symantec Endpoint Protection Manager (SEPM) must also be running at least version 14.3.558. Status and Recommendations

While build 558 was the standard at its release, it has since been superseded by numerous Release Updates (RU) and patches. As of early 2026, the current stable version is 14.4 (Build 115), released in March 2026. Client only patch Endpoint Protection 14.3 (14.3.558.0000)

Symantec Endpoint Protection 14.3 Build 558: What's New and Noteworthy Support and Resources:

Symantec has released an update to its Endpoint Protection suite, version 14.3 build 558. This latest iteration promises to deliver enhanced security features, improved performance, and streamlined management.

Key Features and Enhancements:

What's New in Build 558:

System Requirements:

Upgrade and Installation:

Support and Resources:

Conclusion:

Symantec Endpoint Protection 14.3 build 558 offers enhanced security features, improved performance, and streamlined management. This update is a great opportunity for organizations to strengthen their endpoint security posture. If you're an existing SEP customer or considering endpoint protection solutions, be sure to explore the features and benefits of this latest version.

Deep Dive: Symantec Endpoint Protection 14.3 Build 558 – What You Need to Know