The remote host is missing an update to the system as announced in the referenced advisory.
The following packages are affected: freeciv freeciv-gtk freeciv-gtk2 freeciv-nox11
CVE-2006-0047 packets.c in Freeciv 2.0 before 2.0.8 allows remote attackers to cause a denial of service (server crash) via crafted packets with negative compressed size values.
Solution: Update your system with the appropriate patches or software upgrades.