Integer overflow in the mod_sftp (aka SFTP) module in ProFTPD 1.3.3d and earlier allows remote attackers to cause a denial of service (memory consumption leading to OOM kill) via a malformed SSH message.
http://www.vupen.com/english/advisories/2011/0857
http://www.vupen.com/english/advisories/2011/0617
http://www.debian.org/security/2011/dsa-2185
http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.485806
http://secunia.com/advisories/43978
http://secunia.com/advisories/43635
http://secunia.com/advisories/43234
http://proftp.cvs.sourceforge.net/viewvc/proftp/proftpd/contrib/mod_sftp/packet.h?r1=1.3&r2=1.3.2.1
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058356.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058344.html