Andrew Lock • 10/28/2025

Understanding the worst .NET vulnerability ever: request smuggling and CVE-2025-55315

This technical article provides a deep dive into CVE-2025-55315, a severe .NET security vulnerability involving HTTP request smuggling in ASP.NET Core. It explains the general mechanics of request smuggling attacks, how this specific vulnerability works, its potential impacts like authentication bypass and SSRF, and offers guidance on patching and protection. The post is based on the official Microsoft advisory and analysis from the .NET security team.

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#web security #Aspnet Core #Security Vulnerability