CVE-2013-3171: Microsoft .NET Framework

High severity, CVSS 9.3. EPSS: 20.6% chance of exploitation in the next 30 days.

The serialization functionality in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5 SP1, 3.5.1, 4, and 4.5 does not properly check the permissions of delegate objects, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP) or (2) a crafted .NET Framework application that leverages a partial-trust relationship, aka "Delegate Serialization Vulnerability."

Affected products

• Microsoft .NET Framework: version 2.0 only; version 3.5 only; version 3.5.1 only; version 4.0 only; version 4.5 only

Published 2013-07-10. Last modified 2026-06-16.