Secunia's PSI reports that COREFTP is insecure because version 2.1 build 1568 is not installed. The file version for coreftp.exe reported by Windows explorer is 2.1.0.0 which is why I suspect PSI is reporting that build 1568 isn't installed. Help->about reports Version 2.1, Build 1568
Secunia PSI reports:
"This installation of Core FTP LE 2.x is insecure and potentially exposes your system to security threats!"
The recommendation is:
"Update to version 2.1 Build 1568."