CVE-2014-0253: Microsoft .NET Framework

Medium severity, CVSS 5.0. EPSS: 38.7% chance of exploitation in the next 30 days.

Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5, 3.5.1, 4, 4.5, and 4.5.1 does not properly determine TCP connection states, which allows remote attackers to cause a denial of service (ASP.NET daemon hang) via crafted HTTP requests that trigger persistent resource consumption for a (1) stale or (2) closed connection, as exploited in the wild in February 2014, aka "POST Request DoS Vulnerability."

Affected products

• Microsoft .NET Framework: version 1.1 only; version 2.0 only; version 3.5 only; version 3.5.1 only; version 4.0 only; version 4.5 only; …

Published 2014-02-12. Last modified 2026-06-17.