The remote host is missing an update to openarena announced via advisory DSA 2442-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202442-1

It has been discovered that spoofed getstatus UDP requests are being sent by attackers to servers for use with games derived from the Quake 3 engine (such as openarena). These servers respond with a packet flood to the victim whose IP address was impersonated by the attackers, causing a denial of service. For the stable distribution (squeeze), this problem has been fixed in version 0.8.5-5+squeeze2. For the testing distribution (wheezy) and the unstable distribution (sid), this problem has been fixed in version 0.8.5-6. We recommend that you upgrade your openarena packages.