source: https://www.securityfocus.com/bid/52076/info

Endian Firewall is prone to multiple cross-site scripting vulnerabilities because it fails to sufficiently sanitize user-supplied data.

Exploiting these issues could allow an attacker to execute arbitrary script on the affected server and steal cookie-based authentication credentials. Other attacks are also possible. 

https://www.example.com/cgi-bin/openvpn_users.cgi?=[XSS]