The remote host is missing an update to glibc announced via advisory DSA 149-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20149-1

An integer overflow bug has been discovered in the RPC library used by GNU libc, which is derived from the SunRPC library. This bug could be exploited to gain unauthorized root access to software linking to this code. The packages below also fix integer overflows in the malloc code. They also contain a fix from Andreas Schwab to reduce linebuflen in parallel to bumping up the buffer pointer in the NSS DNS code. This problem has been fixed in version 2.1.3-23 for the old stable distribution (potato), in version 2.2.5-11.1 for the current stable distribution (woody) and in version 2.2.5-13 for the unstable distribution (sid). We recommend that you upgrade your libc6 packages immediately.