Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 stores passwords in plaintext in the "Rumpus User Database" file in the prefs folder, which could allow attackers to gain privileges on the server.
Maxum Rumpus FTP Server 1.3.3 and 2.0.3 dev 3 allows a remote attacker to perform a denial of service (hang) by creating a directory name of a specific length.
Maximum Rumpus FTP Server 2.0.3 dev and before allows an attacker to cause a denial of service (crash) via a mkdir command that specifies a large number of sub-folders.