What it is
CVE-2011-1331 is an unauthenticated vulnerability affecting JustSystems Ichitaro. JustSystems Ichitaro 2005 through 2011, Ichitaro Government 6, Ichitaro Government 2006 through 2010, Ichitaro Portable, Ichitaro Pro,...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2011-1331
Ichitaro Denial of Service
JustSystems / Ichitaro
- Severity
- CVSS 9.3 · High
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 5.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.
Who is affected?
JustSystems / Ichitaro.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Ichitaro Denial of Service
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
- 18 Jul 2011
- Exploitation Reported
- 18 Jul 2011
- Attack vector
- Remote
- Complexity
- —
- Privileges
- None
- User interaction
- —
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2011-1331
- 44956 secunia.com · Third-Party Advisory http://secunia.com/advisories/44956
- JVNDB-2011-000043 jvndb.jvn.jp · Third-Party Advisory http://jvndb.jvn.jp/jvndb/JVNDB-2011-000043
- JVN#87239473 jvn.jp · Third-Party Advisory http://jvn.jp/en/jp/JVN87239473/index.html
- 48283 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/48283
- ichitaro-unspec-bo(68072) exchange.xforce.ibmcloud.com · VDB Entry https://exchange.xforce.ibmcloud.com/vulnerabilities/68072
- justsystems.com/jp/info/js11001.html justsystems.com · CVE Record http://www.justsystems.com/jp/info/js11001.html
- symantec.com/connect/blogs/targeted-attacks-2011-using-ic... symantec.com · CVE Record http://www.symantec.com/connect/blogs/targeted-attacks-2011-using-ich...
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CVE
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2011-07-18 22:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v2.0
9.3
High
AV:N/AC:M/Au:N/C:C/I:C/A:C
EPSS
5.6%
Timeline
From disclosure to observed exploitation
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2011-1331
Free JSON includes basic KEV fields{
"cve_id": "CVE-2011-1331",
"confidence": "High",
"cvss_score": 9.3,
"cvss_estimated": false,
"epss_score": 0.05564,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.