FCKeditor.Java 2.4 allows remote attackers to cause a denial of service (infinite loop) via a malformed request parameter that contains "ctrl" characters.
https://exchange.xforce.ibmcloud.com/vulnerabilities/51738
http://www.securityfocus.com/bid/35709
http://sourceforge.net/project/shownotes.php?release_id=697258
http://secunia.com/advisories/35870