The remote host is missing an update to xboing announced via advisory DSA 451-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20451-1

Steve Kemp discovered a number of buffer overflow vulnerabilities in xboing, a game, which could be exploited by a local attacker to gain gid games. For the current stable distribution (woody) these problems have been fixed in version 2.4-26woody1. For the unstable distribution (sid), these problems have been fixed in version 2.4-26.1. We recommend that you update your xboing package.