Setting File Permissions on VSFTP Upload
Seems like someone has modified your umask already since acording to the vsftpd man file the default is 776. Check your config for the following values and adjust accordingly.
file_open_mode
The permissions with which uploaded files are created. Umasks are applied on top of this value. You may wish to change to 0777 if you want uploaded files to be executable.
Default: 0666
local_umask
The value that the umask for file creation is set to for local users. NOTE! If you want to specify octal values, remember the "0" prefix otherwise the value will be treated as a base 10 integer!
Default: 077