Some Linksys Routers are vulnerable to an authenticated OS command injection. Default credentials for the web interface are admin/admin or admin/password. Since it is a blind os command injection vulnerability, there is no output for the executed command. A ping command against a controlled system for can be used for testing purposes.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/admin/http/linksys_e1500_e2500_exec
msf auxiliary(linksys_e1500_e2500_exec) > show actions
...actions...
msf auxiliary(linksys_e1500_e2500_exec) > set ACTION < action-name >
msf auxiliary(linksys_e1500_e2500_exec) > show options
...show and set options...
msf auxiliary(linksys_e1500_e2500_exec) > run
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