NetScreen ScreenOS Port Scan DoS Vulnerability
NetScreen is a line of Internet security appliances integrating firewall, VPN and traffic management features. ScreenOS is the software used to manage and configure the firewall. NetScreen supports Microsoft Windows 95, 98, ME, NT and 2000 clients.
An issue has been reported in NetScreen ScreenOS which could cause the system to stop responding.
If a user within the trusted network attempts to do a port scan on an external system, ScreenOS could fail requiring a restart. This is due to the number of concurrent sessions allowed per user.
Exploitation of this issue is possible using a port scanner that does not properly release sessions.