HOMEVULNERABILITIESCVE-2011-1331
CRITICAL

CVE-2011-1331

CWE-119Published: July 18, 2011· Updated: Jun 16, 2026

9.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2011-1331 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityM
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityC
IntegrityC
AvailabilityC
AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected Vendors & Products

justsystems4 product(s)
ichitaroichitaro portableichitaro proichitaro viewer
Source: NVD CPE · 16 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttp://www.justsystems.com/jp/info/js11001.html
PATCHhttp://www.justsystems.com/jp/info/js11001.html
ADVISORYhttp://secunia.com/advisories/44956
ADVISORYhttp://secunia.com/advisories/44956

All References (14)

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

Quick Facts

CVE IDCVE-2011-1331
CVSS Score9.3 / 10
SeverityCRITICAL
WeaknessCWE-119
CISA KEVNo
Affected1 vendor(s)
PublishedJul 18, 2011

Related CVEs (CWE-119)

CVE-2011-0264
10.0
CVE-2012-0243
10.0
CVE-2011-0262
10.0
CVE-2011-0263
10.0
CVE-2011-0265
10.0
CVE-1999-0876
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2011-1331 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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