CVE-2011-1978: Microsoft .NET Framework

Medium severity, CVSS 4.3. EPSS: 20.2% chance of exploitation in the next 30 days.

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: version 4.0 only; version 3.5.1 only; version 2.0 only

Published 2011-08-10. Last modified 2026-06-16.