ASP NET Core Vulnerability Risks Injection and Unauthorized Request Execution

EXECUTIVE SUMMARY:

A vulnerability has been identified CVE-2025-55315 in the Kestrel web server component of ASP NET Core, enabling HTTP request smuggling attacks. This flaw allows an attacker to inject a hidden request within a legitimate one, potentially bypassing authentication and security controls. Exploitation could lead to unauthorized actions such as impersonating users, bypassing security checks, or executing injection attacks, depending on the application's configuration and code. It monitors logs for anomalous or partial request patterns, increase alerting on unusual proxy behavior, and limit exposure by implementing network-level filters. The vulnerability has a CVSS score of 9.9.