source: http://www.securityfocus.com/bid/27141/info
Pragma Systems FortressSSH is prone to a remote denial-of-service vulnerability because it fails to adequately handle certain exceptions when processing overly long user-supplied input.
Attackers can exploit this issue to exhaust the maximum number of connections alotted for servers. Successful attacks will deny access to legitimate users.
FortressSSH 5.0 is vulnerable; other versions may also be affected.
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/30989.zip