Zywall USG FLEX Series & ATP Series - V5.42Patch 0 Firmware Release

Zyxel_Melen · February 4

Zywall USG FLEX Series & ATP Series Release Note

(Click the hyperlink to find the firmware file directly)

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S=Standalone mode, C=Cloud mode

New Feature and Enhancements	S	C
1. Anti-Malware allow/block list supports SHA-256 hash value.	V	-
2. [eITS#250801365] Enhanced the format of the Security Policy alert email to improve readability.	V	-
3. [eITS#250901370] Support # and ; as a comment symbol in External Block List (EBL) entry.	V	-
4. [SSL Inspection Statistic]: Removed Maximum Concurrent Session from the GUI. The concurrent session count now turns red when the limit is reached.	V	-
5. Local GUI updated the i-note content for ‘Change to a Different ISP’ in cloud mode.	-	V

S=Standalone mode, C=Cloud mode

Bug fix	S	C
1. eITS#250601128 a. Fix: Unexpected reboot when IPS is enabled.	V	-
2. eITS#250701806 a. Fix: A specific FQDN object is not taking effect in the destination of IP Exception.	V	-
3. eITS#250800047 a. Fix: Disabled Airtime Fairness or Overwrite Full Power settings are not saved to the startup-config.conf file and are unexpectedly re-enabled on APs after the controller is rebooted.	V	-
4. eITS#251001535 a. Fix: It is impossible to configure virtual interface IP after ATP800 is upgraded to 5.41.	V	-
5. eITS#251001984, 251100309 a. Fix: Traffic blocked due to IP-MAC binding table sync issue.	V	-
6. eITS#251002189 a. Fix: DHCP does not work for Built-in AP.	V	-
7. eITS#251201472 a. Fix: SSL Inspection is unable to flush old session and caused concurrent session is increasing until full.	V	-
8. eITS#251200216 a. Fix: False positive offline in Nebula.	-	V
9. Common vulnerabilities and Exposures: ZLD5.42 Patch0 is no longer vulnerable to the following CVE References: ⚫ CVE-2025-11730	V	V

Please refer to the Download Link for more details.