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GitHubsirredbeard/cve-2025-55315-repro

CVE-2025-55315-repro

Tool that reproduces CVE-2025-55315 in ASP.NET Core.

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47617 months agoReviewed by Kitploit

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CVE-2025-55315-repro

This repository contains a small ASP.NET Core console app to reproduce and exercise HTTP chunked-transfer and newline parsing behavior.

More information on CVE-2025-55315.

Contents

Repro/Program.cs - Console app that starts a local Kestrel server and runs two TCP-based tests. The tests send raw HTTP bytes over a TcpClient to exercise chunked transfer parsing and invalid newline handling across fragmented reads.

If these tests fail, you are vulernable to CVE-2025-55315 and need to update your version of .NET (versions 8, 9, and 10) or obtain post-EOL support for .NET (version 6) from HeroDevs.

Passing Tests

image

Failing Tests

image

Prerequisites

.NET SDK 6+

Build and Run

root@kitploit:~
git clone https://github.com/sirredbeard/CVE-2025-55315-repro
cd CVE-2025-55315-repro
dotnet build CVE-2025-55315-repro.sln --framework net6.0
dotnet run --project Repro/Repro.csproj --configuration Debug --framework net6.0
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