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Post #2293 75 Oct 28, 2025, 10:30 UTC

⚡️ Critical .NET flaw enables request smuggling attacks

A 9.9‑severity vulnerability (CVE‑2025‑55315) hits ASP.NET Core, exposing apps to request smuggling. Malformed HTTP traffic can slip past middleware and trigger unauthorized actions on backend servers. Patch immediately — this is one of the most severe .NET security issues to date.

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Andrew Lock | .NET Escapades Understanding the worst .NET vulnerability ever: request smuggling and CVE-2025-55315 In this post I discuss request smuggling, the recent vulnerability in ASP.NET Core with a severity score of 9.9, and how attackers could exploit it

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