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CVE-2011-1978

• Severity: medium (CVSS 4.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 20.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-08-10 · updated 2026-06-16
• Weakness: CWE-200

Description

Microsoft .NET Framework 2.0 SP2, 3.5.1, and 4 does not properly validate the System.Net.Sockets trust level, which allows remote attackers to obtain sensitive information or trigger arbitrary outbound network traffic via (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka "Socket Restriction Bypass Vulnerability."

Affected products

• Microsoft .NET Framework: 4.0, 3.5.1, 2.0-sp2

References

• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-069
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12901
• https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-069
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12901

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