Firewall
ZyXEL

ZyXEL ZyXEL USG FLEX 100

- The ZyXEL USG FLEX 100 is a compact and powerful firewall device designed for small to medium-sized businesses.

ZyXEL ZyXEL USG FLEX 100

Specifications

OS
ZyNOS
IDS/IPS
Yes
LAN
5x GE
USB
1x USB 3.0
UTM
350 Mbps
VPN
270 Mbps
WAN
2x GE

Potential Threats

2
Critical
1
High
1
Medium
0
Low

4 Known CVEs

2 critical vulnerabilities found — immediate patching required.
Low vulnerability count — keep firmware up to date.
Audit firewall rules and remove unused allow entries. Enable detailed logging. Restrict management access to trusted IPs only.

Default IP

192.168.1.1

Default admin panel address for ZyXEL ZyXEL USG FLEX 100

Default Credentials — ZyXEL ZyXEL USG FLEX 100

Username Password Access Type Protocol Port Notes
web HTTPS 443
ssh SSH 22
console Serial Console

Known CVE Vulnerabilities (4)

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FAQ

What is the default password for ZyXEL ZyXEL USG FLEX 100?

The most common default credentials for ZyXEL ZyXEL USG FLEX 100 are listed in the table above. Always change these immediately after setup.

What is the default username for ZyXEL ZyXEL USG FLEX 100?

The default username for ZyXEL ZyXEL USG FLEX 100 is typically "admin". The full list of default credentials including username, password, access type and port is shown in the table on this page.

How do I change the password on ZyXEL ZyXEL USG FLEX 100?

Log in to the admin panel using the default credentials listed above. Navigate to Administration → Password or System → Account settings. Enter the current password and set a new strong password. Save the changes.

How do I reset ZyXEL ZyXEL USG FLEX 100 to factory defaults?

Locate the Reset button (usually a small pinhole on the back/bottom of the device). Hold it for 10-30 seconds while powered on until the LEDs flash. The device will reboot with default settings.

Is it safe to leave default credentials unchanged?

No. Default credentials are publicly known and frequently exploited by automated scanners. Change the admin password immediately after first login.

Does ZyXEL ZyXEL USG FLEX 100 have known security vulnerabilities?

ZyXEL ZyXEL USG FLEX 100 has 4 known CVE vulnerabilities documented in our database. The full list with severity ratings is shown on this page. Apply the latest firmware update from the manufacturer to address known issues.

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