BisonFTP v4r2 is a FTP daemon used on Microsoft Windows 9x/NT systems which has a remote denial of service vulnerability if sent long FTP commands, and can be tricked into revealing information about files outside the ftp root. It’s not possible to get in contact with the people at http://www.bisonftp.com anymore. I guess a new version will never be released.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30832/bisonftp.dos.txt
Source: https://packetstormsecurity.com/files/30832/bisonftp.dos.txt.html