Multiple buffer overflows in DeleGate 7.7.0 through 7.8.1 allow remote attackers to execute arbitrary code, as demonstrated using a long USER command to the POP proxy.
https://exchange.xforce.ibmcloud.com/vulnerabilities/8114
http://www.securityfocus.com/bid/4055
http://www.globalintersec.com/adv/delegate-2002012101.txt
http://online.securityfocus.com/archive/1/256117
http://archives.neohapsis.com/archives/bugtraq/2002-02/0051.html