MediaWiki before 1.19.4 and 1.20.x before 1.20.3 allows remote attackers to cause a denial of service (application crash) by sending a specially crafted request.
https://security-tracker.debian.org/tracker/CVE-2013-1816
https://exchange.xforce.ibmcloud.com/vulnerabilities/88360
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-1816
http://www.securityfocus.com/bid/58306