Ipswitch WS_FTP Server 4.0.2 allows remote authenticated users to execute arbitrary programs as SYSTEM by using the SITE command to modify certain iFtpSvc options that are handled by iftpmgr.exe.
WS_FTP 5.0.2 allows remote authenticated users to cause a denial of service (CPU consumption) via a CD command that contains an invalid path with a "../" sequence.
Multiple buffer overflows in WS_FTP 3 and 4 allow remote authenticated users to cause a denial of service and possibly execute arbitrary code via long (1) APPE (append) or (2) STAT (status) arguments.