A login field longer than 8180 characters sent to the port 3103 causes the immediate freeze of the Pigeon server versions 3.02.0143 and below.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34395/pigeon302.txt
Source: https://packetstormsecurity.com/files/34395/pigeon302.txt.html