What's New ZLD5.39

Zyxel_CSO · October 25

Enjoy stronger traffic control with a new CLI command to drop TCP SYN packets with data, faster filtering, and a fix for Chrome’s TLS 1.3 content filter bug. Update today for seamless protection.

Zyxel is committed to continuously updating your devices for important maintenance information. This latest release also enhances the all-round functions of Zyxel Firewall products including:

➡ Table 1: Feature Enhancements

Item	Description
Feature Enhancement	CLI created to enable "Drop TCP SYN packets with data".
Feature Enhancement	Optimize URL Threat Filter/Content Filter scan flow to avoid unnecessary inspections.

➡ Table 2: Resolved Issues

Bug ID	Description
240401350 240401693 240501058 240701813	Content Filtering is not working because TLS 1.3 Kyber support is introduced in Chrome.
240501893	Device becomes unresponsive after interface is disabled in device HA.
240600228	SSL inspection can't work within latest Chrome version.
240700190	Unable to backup configuration file from SecuManager.

➡ Upgrade your devices to ZLD5.39 for enhanced protection against the CVE references listed, as ZLD5.39 is no longer vulnerable to them.

Release Date: September 3th, 2024

Supported Models: ATP Series/USG FLEX Series/USG FLEX 50 (USG20-VPN)/USG20W-VPN

What's New ZLD5.39

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