CVE-2011-1331: Justsystems Ichitaro

High severity, CVSS 9.3. EPSS: 5.6% chance of exploitation in the next 30 days.

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.

Affected products

• Justsystems Ichitaro: version 6 only; version 2005 only; version 2006 only; version 2007 only; version 2008 only; version 2009 only; …
• Justsystems Ichitaro Portable: any version
• Justsystems Ichitaro Pro: any version
• Justsystems Ichitaro Viewer: any version; version 5.1.3.0 only; version 19.0.1.0 only; version 19.0.2.0 only; version 19.0.3.0 only; version 20.0.2.0 only

Published 2011-07-18. Last modified 2026-06-16.