The remote host is missing an update to memcached announced via advisory DSA 1853-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201853-1

Ronald Volgers discovered that memcached, a high-performance memory object caching system, is vulnerable to several heap-based buffer overflows due to integer conversions when parsing certain length attributes. An attacker can use this to execute arbitrary code on the system running memcached (on etch with root privileges). For the oldstable distribution (etch), this problem has been fixed in version 1.1.12-1+etch1. For the stable distribution (lenny), this problem has been fixed in version 1.2.2-1+lenny1. For the testing (squeeze) and unstable (sid) distribution , this problem will be fixed soon. We recommend that you upgrade your memcached packages.