While a dictionary attack can be done manually by an individual, it is easily done via software and a database with millions of words. See brute force attack and Captcha. THIS DEFINITION IS FOR ...

What they lack in sophistication, they make up for in sheer persistence — brute-force attacks can be surprisingly effective, especially against weak or short passwords. In a dictionary attack ...

A dictionary attack is a variation of brute force attacks where the hacker uses a precompiled list of potential passwords.

It would allow a remote, unauthenticated attacker to access the module via FTP by dictionary attack or password sniffing. The advisory includes other vulnerabilities with lower severity scores.