What’s Vulnerable › Vulnerabilities

CVE-2011-3414

• Severity: high (CVSS 7.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 57.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-12-30 · updated 2026-06-16
• Weakness: CWE-399

Description

The CaseInsensitiveHashProvider.getHashCode function in the HashTable implementation in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters, aka "Collisions in HashTable May Cause DoS Vulnerability."

Affected products

• Microsoft Windows 7: all versions
• Microsoft Windows Server 2003: all versions
• Microsoft Windows Server 2008: r2
• Microsoft Windows Vista: all versions
• Microsoft Windows XP Service Pack 3: sp3-unknown

References

• http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
• http://www.kb.cert.org/vuls/id/903934
• http://www.nruns.com/_downloads/advisory28122011.pdf
• http://www.ocert.org/advisories/ocert-2011-003.html
• http://www.us-cert.gov/cas/techalerts/TA11-347A.html
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14588
• http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
• http://www.kb.cert.org/vuls/id/903934
• http://www.nruns.com/_downloads/advisory28122011.pdf
• http://www.ocert.org/advisories/ocert-2011-003.html
• http://www.us-cert.gov/cas/techalerts/TA11-347A.html

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