The remote host is missing an update to purity announced via advisory DSA 166-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20166-1

Two buffer overflows have been discovered in purity, a game for nerds and hackers, which is installed setgid games on a Debian system. This problem could be exploited to gain unauthorized access to the group games. A malicious user could alter the highscore of several games. This problem has been fixed in version 1-14.2 for the current stable distribution (woody), in version 1-9.1 for the old stable distribution (potato) and in version 1-16 for the unstable distribution (sid). We recommend that you upgrade your purity packages.