CVE-2011-1331

Exp

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.

Published: 2011-07-18 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-1331 is rated High Exploit Risk (83.5/100): CVSS Critical severity, with high exploitation likelihood (EPSS 5.56%, 92th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2011-1331

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-1331

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 6.40% 5.56% -0.84%
2 2026-04-07 3.97% 6.40% +2.43%
3 2026-01-17 — 3.97% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-1331

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.3 2.0 HIGH
AV:N/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.6 10.0 [email protected]

Weakness enumeration for CVE-2011-1331

Affected software / configurations for CVE-2011-1331

Vendor Product Version Raw CPE
justsystems ichitaro 6 cpe:2.3:a:justsystems:ichitaro:6:-:government:*:*:*:*:*
justsystems ichitaro 2005 cpe:2.3:a:justsystems:ichitaro:2005:*:*:*:*:*:*:*
justsystems ichitaro 2006 cpe:2.3:a:justsystems:ichitaro:2006:*:*:*:*:*:*:*
justsystems ichitaro 2006 cpe:2.3:a:justsystems:ichitaro:2006:-:government:*:*:*:*:*
justsystems ichitaro 2007 cpe:2.3:a:justsystems:ichitaro:2007:*:*:*:*:*:*:*
justsystems ichitaro 2007 cpe:2.3:a:justsystems:ichitaro:2007:-:government:*:*:*:*:*
justsystems ichitaro 2008 cpe:2.3:a:justsystems:ichitaro:2008:*:*:*:*:*:*:*
justsystems ichitaro 2008 cpe:2.3:a:justsystems:ichitaro:2008:-:government:*:*:*:*:*
justsystems ichitaro 2009 cpe:2.3:a:justsystems:ichitaro:2009:*:*:*:*:*:*:*
justsystems ichitaro 2009 cpe:2.3:a:justsystems:ichitaro:2009:-:government:*:*:*:*:*
justsystems ichitaro 2010 cpe:2.3:a:justsystems:ichitaro:2010:*:*:*:*:*:*:*
justsystems ichitaro 2010 cpe:2.3:a:justsystems:ichitaro:2010:-:government:*:*:*:*:*
justsystems ichitaro 2011 cpe:2.3:a:justsystems:ichitaro:2011:*:*:*:*:*:*:*
justsystems ichitaro_portable — cpe:2.3:a:justsystems:ichitaro_portable:*:*:*:*:*:*:*:*
justsystems ichitaro_pro — cpe:2.3:a:justsystems:ichitaro_pro:*:*:*:*:*:*:*:*
justsystems ichitaro_viewer — cpe:2.3:a:justsystems:ichitaro_viewer:*:*:*:*:*:*:*:*
justsystems ichitaro_viewer 5.1.3.0 cpe:2.3:a:justsystems:ichitaro_viewer:5.1.3.0:*:*:*:*:*:*:*
justsystems ichitaro_viewer 19.0.1.0 cpe:2.3:a:justsystems:ichitaro_viewer:19.0.1.0:*:*:*:*:*:*:*
justsystems ichitaro_viewer 19.0.2.0 cpe:2.3:a:justsystems:ichitaro_viewer:19.0.2.0:*:*:*:*:*:*:*
justsystems ichitaro_viewer 19.0.3.0 cpe:2.3:a:justsystems:ichitaro_viewer:19.0.3.0:*:*:*:*:*:*:*
justsystems ichitaro_viewer 20.0.2.0 cpe:2.3:a:justsystems:ichitaro_viewer:20.0.2.0:*:*:*:*:*:*:*

References for CVE-2011-1331

cvelogic Threat Intelligence