Open Dental before version 18.4 transmits the entire user database over the network when a remote unauthenticated user accesses the command prompt. This allows the attacker to gain access to usernames, password hashes, privilege levels, and more.
Open Dental before version 18.4 installs a mysql database and uses the default credentials of "root" with a blank password. This allows anyone on the network with access to the server to access all database information.