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TechRadar
TechRadar
Sead Fadilpašić

Microsoft fixes one of its "highest ever" rated security flaws - here's what happened

Representational image depecting cybersecurity protection.
  • CVE-2025-55315 enables HTTP request smuggling in ASP.NET Core’s Kestrel web server
  • Attackers can bypass controls, access credentials, alter files, or crash the server
  • Microsoft released updates for affected .NET and Visual Studio versions to mitigate the flaw

Microsoft has confirmed it recently fixed its “highest ever” vulnerability plaguing its ASP.NET Core product.

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