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NVD / CVE Program· CNA jpcert

CVE-2011-1331: JustSystems Ichitaro 2005 through 2011, Ichitaro Government 6, Ichitaro Government 2006 through 2010, Ichitaro Portable, Ichitaro Pro, and…

CriticalCVSS 9.3 · v2.0—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 5.5% (FIRST EPSS); higher than 92.9% of all records.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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
Jul 18, 2011
Updated
Jun 16, 2026
EPSS
5.5% · 92th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2011-1331

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
justsystemsichitaro
justsystemsichitaro portable
justsystemsichitaro pro
justsystemsichitaro viewer

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • justsystems ichitaro2005
  • justsystems ichitaro2006
  • justsystems ichitaro2007
  • justsystems ichitaro2008
  • justsystems ichitaro2009
  • justsystems ichitaro2010
  • justsystems ichitaro2011
  • justsystems ichitaro6
+8 more rows
  • justsystems ichitaro portableall versions
  • justsystems ichitaro proall versions
  • justsystems ichitaro viewerall versions
  • justsystems ichitaro viewer19.0.1.0
  • justsystems ichitaro viewer19.0.2.0
  • justsystems ichitaro viewer19.0.3.0
  • justsystems ichitaro viewer20.0.2.0
  • justsystems ichitaro viewer5.1.3.0

Same product

justsystems: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-7247Unspecified vulnerability in JustSystems Ichitaro 2008 through 2011; Ichitaro Government 6, 7, 2008, 2009, and 2010; Ichitaro Pro; Ichitaro…
    42Plan
  • CVE-2013-3644Unspecified vulnerability in JustSystems Ichitaro 2006 through 2013; Ichitaro Pro through 2; Ichitaro Government 6, 7, and 2006 through…
    41Plan
  • CVE-2017-2790When processing a record type of 0x3c from a Workbook stream from an Excel file (.xls), JustSystems Ichitaro Office trusts that the size is…
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2010-3915Nov 5, 2010 · Unspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute arbitrary code via a crafted…
    39Monitor
  • ← EarlierCVE-2010-3916Nov 5, 2010 · Unspecified vulnerability in JustSystems Ichitaro and Ichitaro Government allows remote attackers to execute arbitrary code via a crafted…
    39Monitor
  • Later →CVE-2012-0269Apr 27, 2012 · Buffer overflow in JustSystems Ichitaro 2011 Sou, Ichitaro 2006 through 2011, Ichitaro Government 2006 through 2010, Ichitaro Portable with…
    38Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

    If successful

    Confidentiality
    C · data can be read
    Integrity
    C · data or configuration can be modified
    Availability
    C · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    C
    Integrity impact
    C
    Availability impact
    C

    Weakness class (CWE)

    CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

    CVSS vector

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

    nvd-primary

    Attack context

    MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

    ATT&CK techniques

    —

    References

    Show all references (5 more)

    Vendor advisories and official records. Exploit/PoC links are deliberately left out.

    All records