CVE-2013-1337: Microsoft .NET Framework

High severity, CVSS 7.5. EPSS: 20.6% chance of exploitation in the next 30 days.

Microsoft .NET Framework 4.5 does not properly create policy requirements for custom Windows Communication Foundation (WCF) endpoint authentication in certain situations involving passwords over HTTPS, which allows remote attackers to bypass authentication by sending queries to an endpoint, aka "Authentication Bypass Vulnerability."

Affected products

• Microsoft .NET Framework: version 4.5 only

Published 2013-05-15. Last modified 2026-06-16.