The version of CitectSCADA installed on the remote host includes an ODBC server that listens by default on TCP port 20222 and reportedly is affected by a stack-buffer overflow vulnerability.
Using a specially-crafted sequence of packets, an unauthenticated remote attacker who can connect to the server can leverage this issue to crash the affected service or to execute code on the affected host with SYSTEM-level privileges.
Binary data citectscada_odbc_overflow.nbin