Zywall USG FLEX Series & ATP Series - V5.43Patch 0 Firmware Release

Zyxel_Melen

Zywall USG FLEX Series & ATP Series Release Note 

August 2026

Firmware Version on all models

(Click the hyperlink to find the firmware file directly)

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FLEX Series	Download link	ATP Series	Download link
FLEX50/USG20-VPN	V5.43(ABAQ.0)C0	ATP100	V5.43(ABPS.0)C0
FLEX50W/USG20W-VPN	V5.43(ABAR.0)C0	ATP100W	V5.43(ABRW.0)C0
FLEX50AX	V5.43(ACGB.0)C0	ATP200	V5.43(ABFW.0)C0
FLEX100	V5.43(ABUH.0)C0	ATP500	V5.43(ABFU.0)C0
FLEX100W	V5.43(ABWC.0)C0	ATP700	V5.43(ABTJ.0)C0
FLEX100AX	V5.43(ACFN.0)C0	ATP800	V5.43(ABIQ.0)C0
FLEX200	V5.43(ABUI.0)C0
FLEX500	V5.43(ABUJ.0)C0
FLEX700	V5.43(ABWD.0)C0

New Feature and Enhancements

N/A

Bug Fix

S=Standalone mode, C=Cloud mode

Bug fix	S	C
1. eITS#260701409, 260701436, 260701495 a. Fix: LAN hosts cannot browse websites or access the Web GUI due to HTTP/HTTPS traffic being misrouted.	V	-
2. Common vulnerabilities and Exposures: ZLD5.43 Patch0 is no longer vulnerable to the following CVE References: ⚫ CVE-2026-14818	V	V

Please refer to the Download Link for more details.