Luigi Auriemma discovered a denial of service condition in the free Civilization server that allows a remote user to trigger a server crash.
The old stable distribution (woody) is not affected by this problem.
For the stable distribution (sarge) this problem has been fixed in version 2.0.1-1sarge1.
For the unstable distribution (sid) this problem has been fixed in version 2.0.8-1.
We recommend that you upgrade your freeciv-server package.
MD5 checksums of the listed files are available in the original advisory.