aspWebCalendar Free Edition suffers from a database disclosure vulnerability.
c0ecbfa4fee7f3411e7ee2cdd21f32a54ae3649c1aa8949f20bc9794f0167af2
I'm not sure how to classify this bug / vulnerability, but for aspWebCalendar Free edition, you can openly download the mdb file and read its contents (username,pasword).
Example
http://www.example.com/calendar/calendar.mdb
I guess the fix would be to place the mdb file outside of wwwroot.