December 15, 2025 release

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This Trellix Endpoint Detection and Response 4.2.1 (On-premises and SaaS) release includes new features, enhancements, and resolved issues for macOS endpoints.

Release details

Component

Version

Trellix EDR Client for macOS

4.2.1.4934

Trellix EDR Client Extension

4.2.2.3

Trellix EDR Rules for macOS

4.2.1.4934

New or changed

  • Installer validation

    The Trellix EDR client installer for macOS now verifies if the Trellix EDR with Forensics client is installed on the endpoint. If Trellix EDR with Forensics is detected, the EDR client installation stops automatically to prevent simultaneous execution, ensuring a supported configuration.

Resolved issues

Reference

Resolution

SEC-191943

Resolves an issue where the Trellix EDR client on macOS experienced persistent memory growth.

SEC-189352

Resolves an issue where the Trellix EDR client for macOS could not connect to the ePO server from a quarantined endpoint using Fully Qualified Domain Name (FQDN) URLs.

Known issues

For a list of known issues in this product release, see KB91275.

Installation information

The Trellix Endpoint Detection and Response Installation Guide provides information for installing the product and migrating from Trellix® Active Response.