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**Name of the Vulnerable Software and Affected Versions** KnFTP version 1.0.0 **Description** The issue allows remote attackers to execute arbitrary code via a long string to various commands, including the `USER`, `PASS`, `REIN`, `QUIT`, `PORT`, `PASV`, `TYPE`, `STRU`, `MODE`, `RETR`, `STOR`, `APPE`, `ALLO`, `REST`, `RNFR`, `RNTO`, `ABOR`, `DELE`, `CWD`, `LIST`, `NLST`, `SITE`, `STST`, `HELP`, `NOOP`, `MKD`, `RMD`, `PWD`, `CDUP`, `STOU`, `SNMT`, `SYST`, and `XPWD` commands. **Recommendations** For KnFTP version 1.0.0, update to a newer version that contains a fix for this issue.