Directory traversal vulnerability in Serv-U FTP Server before 11.1.0.5 allows remote authenticated users to read and write arbitrary files, and list and create arbitrary directories, via a "..:/" (dot dot colon forward slash) in the (1) list, (2) put, or (3) get commands.

Directory traversal vulnerability in Serv-U before 9.2.0.1 allows remote authenticated users to read arbitrary files via unspecified vectors.

Serv-U FTP Server before 6.1.0.4 allows attackers to cause a denial of service (crash) via (1) malformed packets and possibly other unspecified issues with unknown impact and attack vectors including (2) use of "~" in a pathname, and (3) memory consumption of the daemon. NOTE: it is not clear whether items (2) and above are vulnerabilities.

Serv-U FTP server before 5.1.0.0 has a default account and password for local administration, which allows local users to execute arbitrary commands by connecting to the server using the default administrator account, creating a new user, logging in as that new user, and then using the SITE EXEC command.

Stack-based buffer overflow in the site chmod command in Serv-U FTP Server before 4.2 allows remote attackers to execute arbitrary code via a long filename.

Buffer overflow in Serv-U ftp before 5.0.0.4 allows remote authenticated users to execute arbitrary code via a long time zone argument to the MDTM command.

Buffer overflow in Serv-U FTP server before 5.0.0.6 allows remote attackers to cause a denial of service (crash) via a long -l parameter, which triggers an out-of-bounds read.

The remote administration client for RhinoSoft Serv-U 3.0 sends the user password in plaintext even when S/KEY One-Time Password (OTP) authentication is enabled, which allows remote attackers to sniff passwords.