NullSearchAccess is a scanner that attempts default logins for various services like ftp, pop3, imap, mysql, and more.
You can download it from the following link: https://packetstormsecurity.com/files/download/79371/NullSearchAccessV1-2.tar.gz
Source: https://packetstormsecurity.com/files/79371/NullSearchAccess-Login-Scanner.html