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Vulnerability record · CVE-2011-1331 · published 18 July 2011

CVE-2011-1331: Justsystems ichitaro memory buffer overflow vulnerability

Justsystems · Ichitaro

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.

9.3 CVSS 2.0 High EPSS 5.6% · top 7.4% CWE-119 · Memory buffer overflow
9.3CVSS 2.0 base score
5.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
14References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://jvn.jp/en/jp/JVN87239473/index.html
http://jvndb.jvn.jp/jvndb/JVNDB-2011-000043
http://secunia.com/advisories/44956 Vendor Advisory
http://www.justsystems.com/jp/info/js11001.html PatchVendor Advisory
http://www.securityfocus.com/bid/48283
http://www.symantec.com/connect/blogs/targeted-attacks-2011-using-ichitaro-zero-day-vulnerability Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/68072
http://jvn.jp/en/jp/JVN87239473/index.html
http://jvndb.jvn.jp/jvndb/JVNDB-2011-000043
http://secunia.com/advisories/44956 Vendor Advisory
http://www.justsystems.com/jp/info/js11001.html PatchVendor Advisory
http://www.securityfocus.com/bid/48283
http://www.symantec.com/connect/blogs/targeted-attacks-2011-using-ichitaro-zero-day-vulnerability Exploit
https://exchange.xforce.ibmcloud.com/vulnerabilities/68072

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2014-7247Justsystems ichitaro vulnerabilityUnspecified vulnerability in JustSystems Ichitaro 2008 through 2011; Ichitaro Government 6, 7, 2008, 2009, and 2010; Ichitaro Pro; Ichitaro Pro 2; Ic…EPSS 5.3%10.0CVE-2013-3644Justsystems ichitaro vulnerabilityUnspecified vulnerability in JustSystems Ichitaro 2006 through 2013; Ichitaro Pro through 2; Ichitaro Government 6, 7, and 2006 through 2010; Ichitar…EPSS 4.2%9.8CVE-2017-2789Justsystems ichitaro memory buffer overflow vulnerabilityWhen copying filedata into a buffer, JustSystems Ichitaro Office 2016 Trial will calculate two values to determine how much data to copy from the doc…EPSS 2.3%9.8CVE-2017-2790Justsystems ichitaro memory buffer overflow vulnerabilityWhen processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro Office trusts that the size is greater t…EPSS 1.9%9.3CVE-2013-5990Justsystems ichitaro pro vulnerabilityUnspecified vulnerability in JustSystems Ichitaro 2006 through 2011; Ichitaro Government 6, 7, and 2006 through 2010; Ichitaro 2011 Sou; Ichitaro 201…EPSS 4.6%9.3CVE-2013-0707Justsystems hanako vulnerabilityUnspecified vulnerability in JustSystems Ichitaro 2006 and 2007, Ichitaro Government 2006 and 2007, Ichitaro Portable with oreplug, Hanako 2006 throu…EPSS 3.8%9.3CVE-2012-0269Justsystems ichitaro memory buffer overflow vulnerabilityBuffer overflow in JustSystems Ichitaro 2011 Sou, Ichitaro 2006 through 2011, Ichitaro Government 2006 through 2010, Ichitaro Portable with oreplug, …EPSS 4.2%9.3CVE-2010-3915Justsystems ichitaro vulnerabilityUnspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute arbitrary code via a crafted document, a…EPSS 6.1%

Source: NIST National Vulnerability Database (record CVE-2011-1331), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.