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.
source: wwwsecurityfocuscom/bid/11065/info
WS_FTP Server is reported prone to a remote denial of service vulnerability This issue presents itself when the application processes a malformed file path through the 'cd' command
WS_FTP Server version 502 is reported prone to this issue, however, other versions may be affected as well
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Vulmon