The S2 Security NetBox, possibly 2.x and 3.x, as used in the Linear eMerge 50 and 5000 and the Sonitrol eAccess, does not require setting a password for the FTP server that stores database backups, which makes it easier for remote attackers to download backup files via unspecified FTP requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/59828
http://www.darkreading.com/blog/archives/2010/04/attacking_door.html