What it is
CVE-2011-3402 is an unauthenticated vulnerability affecting Microsoft Windows. Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2011-3402
Windows
Microsoft / Windows
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 78.3%
- 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 confirmed.
Who is affected?
Microsoft / Windows.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Windows
Unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page, as exploited in the wild in November 2011 by Duqu, aka "TrueType Font Parsing Vulnerability."
- Published
- 04 Nov 2011
- Exploitation Reported
- 04 Nov 2011
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
Tags
cisa
windows
microsoft
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2011-3402
- MS11-087 docs.microsoft.com · Vendor Advisory https://docs.microsoft.com/en-us/security-updates/securitybulletins/2...
- MS12-034 docs.microsoft.com · Vendor Advisory https://docs.microsoft.com/en-us/security-updates/securitybulletins/2...
- MS12-039 docs.microsoft.com · Vendor Advisory https://docs.microsoft.com/en-us/security-updates/securitybulletins/2...
- 49121 secunia.com · Third-Party Advisory http://secunia.com/advisories/49121
- TA12-164A us-cert.gov · Third-Party Advisory http://www.us-cert.gov/cas/techalerts/TA12-164A.html
- 49122 secunia.com · Third-Party Advisory http://secunia.com/advisories/49122
- TA11-347A us-cert.gov · Third-Party Advisory http://www.us-cert.gov/cas/techalerts/TA11-347A.html
- TA12-129A us-cert.gov · Third-Party Advisory http://www.us-cert.gov/cas/techalerts/TA12-129A.html
- oval:org.mitre.oval:def:15645 oval.cisecurity.org · VDB Entry https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.m...
- 1027039 securitytracker.com · VDB Entry http://www.securitytracker.com/id?1027039
- oval:org.mitre.oval:def:13998 oval.cisecurity.org · VDB Entry https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.m...
- oval:org.mitre.oval:def:15290 oval.cisecurity.org · VDB Entry https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.m...
- blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2... blogs.mcafee.com · CVE Record http://blogs.mcafee.com/mcafee-labs/the-day-of-the-golden-jackal-%E2%...
- symantec.com/content/en/us/enterprise/media/security_resp... symantec.com · CVE Record http://www.symantec.com/content/en/us/enterprise/media/security_respo...
- us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdf us-cert.gov · CVE Record http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-291-01E.pdf
- securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_Two securelist.com · CVE Record http://www.securelist.com/en/blog/208193197/The_Mystery_of_Duqu_Part_Two
- technet.microsoft.com/security/advisory/2639658 technet.microsoft.com · CVE Record http://technet.microsoft.com/security/advisory/2639658
- isc.sans.edu/diary/Duqu+Mitigation/11950 isc.sans.edu · CVE Record http://isc.sans.edu/diary/Duqu+Mitigation/11950
- symantec.com/connect/w32-duqu_status-updates_installer-ze... symantec.com · CVE Record http://www.symantec.com/connect/w32-duqu_status-updates_installer-zer...
- blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases... blogs.technet.com · CVE Record http://blogs.technet.com/b/msrc/archive/2011/11/03/microsoft-releases...
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 | 2011-11-04 21:00 UTC |
| CISA | 2026-06-02 14:05 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 v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
78.3%
All CVSS Scores
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0
9.3
High
AV:N/AC:M/Au:N/C:C/I:C/A:C
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
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-2011-3402
Free JSON includes basic KEV fields{
"cve_id": "CVE-2011-3402",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.78285,
"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.