CVE-2013-3861: Microsoft .NET Framework

High severity, CVSS 7.8. EPSS: 82.4% chance of exploitation in the next 30 days.

Microsoft .NET Framework 2.0 SP2, 3.5, 3.5 SP1, 3.5.1, 4, and 4.5 allows remote attackers to cause a denial of service (application crash or hang) via crafted character sequences in JSON data, aka "JSON Parsing 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 2013-10-09. Last modified 2026-06-16.