A denial of service flaw was found in the way the server component of Freeciv before 2.3.4 processed certain packets. A remote attacker could send a specially-crafted packet that, when processed would lead to memory exhaustion or excessive CPU consumption.
https://security-tracker.debian.org/tracker/CVE-2012-5645
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-5645
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=696306
http://www.securityfocus.com/bid/41352
http://www.openwall.com/lists/oss-security/2012/12/31/2
http://www.openwall.com/lists/oss-security/2012/12/30/8
http://www.openwall.com/lists/oss-security/2012/12/30/11
http://www.openwall.com/lists/oss-security/2012/12/22/4
http://www.openwall.com/lists/oss-security/2012/12/18/5
http://lists.fedoraproject.org/pipermail/package-announce/2013-January/096391.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-January/095381.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-January/095378.html