JustSystems Ichitaro 2005 through 2011, Ichitaro Government 6, Ichitaro Government 2006 through 2010, Ichitaro Portable, Ichitaro Pro, and Ichitaro Viewer allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via a crafted document, as exploited in the wild in early 2011.
https://exchange.xforce.ibmcloud.com/vulnerabilities/68072
http://www.securityfocus.com/bid/48283
http://www.justsystems.com/jp/info/js11001.html
http://secunia.com/advisories/44956