[2026 September Notification] ZLD 5.43 Update: Enhanced Security with Critical Vulnerability Fixes

Zyxel_Avani

Zyxel is committed to keeping your devices up to date for optimal performance and security. This release includes key maintenance updates and enhancements, such as:

• Feature Enhancements/Changes and Consolidated Bug fixes

Resolved issues*

Bug ID	Description
260701495 260701436 260701409	Fix: LAN hosts cannot browse websites or access the Web GUI due to HTTP/HTTPS traffic being misrouted.

*For full details, please refer to the release notes.

• Upgrade your devices to ZLD5.43 for enhanced protection against the CVE references listed, as ZLD5.43 is no longer vulnerable to them.

－ CVE-2026-14818

To maintain the highest level of security, always follow security best practices after a firmware upgrade, including changing the administrator password.

Release Date: August 3th, 2026
Supported Models: ATP Series/USG FLEX Series/USG FLEX 50 (USG20-VPN)/USG20W-VPN