telnetd.exe in Pragma TelnetServer 7.0.4.589 allows remote attackers to cause a denial of service (process crash and resource exhaustion) via a crafted TELOPT PRAGMA LOGON telnet option, which triggers a NULL pointer dereference.
https://exchange.xforce.ibmcloud.com/vulnerabilities/39353
http://www.securityfocus.com/bid/27143