OpenTTD 0.4.7 and earlier allows local users to cause a denial of service (application exit) via a large invalid error number, which triggers an error.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26000
http://www.vupen.com/english/advisories/2006/1480
http://www.securityfocus.com/bid/17661
http://www.securityfocus.com/archive/1/431871/100/0/threaded
http://security.gentoo.org/glsa/glsa-200609-03.xml