freeSSHd.exe in freeSSHd through 1.2.6 allows remote attackers to bypass authentication via a crafted session, as demonstrated by an OpenSSH client with modified versions of ssh.c and sshconnect2.c.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-5940
http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0012.html