RealTerm Serial Terminal version 2.0.0.70 suffers from an echo port buffer overflow vulnerability. Modifications to the original proof of concept include the fact that it uses a larger payload size for shellcode due to different jump offsets and filters the bad character 0x3a as this is the character for port which causes an error ":".
7d6aa76dc1238452c1e6142d776b2b51e99c79aa8cf79ef87b7b1cde732ae71f