Directory traversal vulnerability in SoftX FTP Client 3.3 and possibly earlier allows remote FTP servers to write arbitrary files via "..\" (dot dot backslash) sequences in a filename.
Improper Limitation of a Pathname to a Restricted Directory The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.