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.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25166
http://www.vupen.com/english/advisories/2006/0838
http://www.securityfocus.com/bid/16975
http://www.securityfocus.com/archive/1/426866/100/0/threaded
http://www.mandriva.com/security/advisories?name=MDKSA-2006:053
http://www.gentoo.org/security/en/glsa/glsa-200603-11.xml
http://www.debian.org/security/2006/dsa-994
http://secunia.com/advisories/19253
http://secunia.com/advisories/19227