Squid proxy server 2.4 and earlier allows remote attackers to cause a denial of service (crash) via a mkdir-only FTP PUT request.
https://exchange.xforce.ibmcloud.com/vulnerabilities/7157
http://www.securityfocus.com/bid/3354
http://www.redhat.com/support/errata/RHSA-2001-113.html
http://www.novell.com/linux/security/advisories/2001_037_squid_txt.html
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-088.php3
http://www.debian.org/security/2001/dsa-077
http://marc.info/?l=bugtraq&m=100109679010256&w=2
http://archives.neohapsis.com/archives/linux/conectiva/2001-q3/0020.html