# CVE-2025-55315: ASP.NET Security Feature Bypass Vulnerability > An authorized attacker can bypass security features via HTTP request smuggling in ASP.NET Core, requiring a patch. - **Severity:** Critical 9.9 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 14 Oct 2025 - **Updated:** 22 Feb 2026 - **Also known as:** BELL-CVE-2025-55315, BIT-aspnet-core-2025-55315, GHSA-5rrx-jjjq-q2r5, UBUNTU-CVE-2025-55315 ## What is CVE-2025-55315? CVE-2025-55315 is a critical vulnerability in Microsoft Visual Studio 2022, published on 14 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network. Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests) ## Which versions are affected by CVE-2025-55315? 40 open source packages ship an affected version, including Microsoft.AspNetCore.App.Runtime.linux-arm, aspnet-core and Microsoft.AspNetCore.App.Runtime.linux-arm64. It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-arm` | NuGet | From 9.0.0 | 9.0.10 | | `aspnet-core` | Bitnami | From 2.3.0 | 2.3.6, 8.0.21, 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-arm64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-arm64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-musl-x64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 8.0.0 | 8.0.21 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.linux-x64` | NuGet | From 9.0.0 | 9.0.10 | | `Microsoft.AspNetCore.App.Runtime.osx-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.osx-arm64` | NuGet | From 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 | | `Microsoft.AspNetCore.App.Runtime.osx-arm64` | NuGet | From 8.0.0 | 8.0.21 | Products: Microsoft Asp.net Core, Microsoft Visual Studio 2022. ## How do I fix CVE-2025-55315? Upgrade Microsoft.AspNetCore.App.Runtime.linux-arm to a fixed version for your release line: 10.0.0-rc.2.25502.107, 8.0.21 or 9.0.10. ## Is CVE-2025-55315 being exploited? It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55315 exists. Public exploit code: - Tool that reproduces CVE-2025-55315 in ASP.NET Core. (github_poc): https://github.com/sirredbeard/CVE-2025-55315-repro - CVE-2025-55315 PoC Exploit (github_poc): https://github.com/ZemarKhos/CVE-2025-55315-PoC-Exploit - Playground to experiment with different behavior on patched/unpatched Kestrel for the CVE-2025-55315 HTTP smuggling vulnerability (github_poc): https://github.com/nickcopi/CVE-2025-55315-detection-playground - 专业级HTTP请求走私漏洞利用与自动化渗透测试工具 (github_poc): https://github.com/7huukdlnkjkjba/CVE-2025-55315- - Quick and Simple Scripts to Scan for Vulnerable Servers and Packet Level Monitors (github_poc): https://github.com/jlinebau/CVE-2025-55315-Scanner-Monitor - Proof-of-concept exploit for CVE-2025-55315 (.NET HTTP Request Smuggling). Demonstrates how improperly parsed chunked encoding lets attackers smuggle requests past proxies and load balancers in vulnerable ASP.NET Core/Kestrel servers. (github_poc): https://github.com/MartinFabianIonut/CVE-2025-55315 ## Other vulnerabilities in Microsoft Visual Studio 2022 - [CVE-2026-88092](https://insights.sbomify.com/CVE-2026-88092/): ASP.NET Core Tampering Vulnerability (critical 9.4) - [CVE-2026-40372](https://insights.sbomify.com/CVE-2026-40372/): ASP.NET Core Elevation of Privilege Vulnerability (critical 9.1) - [CVE-2021-43877](https://insights.sbomify.com/CVE-2021-43877/): ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability (high 8.8) - [CVE-2020-0603](https://insights.sbomify.com/CVE-2020-0603/): Remote code execution in ASP.NET Core (high 8.8) - [CVE-2019-1302](https://insights.sbomify.com/CVE-2019-1302/): Elevation of privilege in ASP.NET Core (high 8.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2025-55315 and fix it if it is affected. What it is: CVE-2025-55315 is a critical vulnerability in Microsoft Visual Studio 2022, published on 14 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-55315 exists. Affected packages and fixed versions: - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 10.0.0-rc.1.25451.107; fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 10.0.0-rc.1.25451.107; fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 8.0.0; fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): affected from 9.0.0; fixed in 9.0.10 - aspnet-core (Bitnami): affected from 2.3.0; fixed in 2.3.6, 8.0.21, 9.0.10 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 10.0.0-rc.1.25451.107; fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 10.0.0-rc.1.25451.107; fixed in 10.0.0-rc.2.25502.107 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 8.0.0; fixed in 8.0.21 - Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): affected from 9.0.0; fixed in 9.0.10 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2025-55315/ (Markdown: https://insights.sbomify.com/CVE-2025-55315/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55315 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55315 - OSV: https://osv.dev/vulnerability/CVE-2025-55315 --- From sbomify Insights: https://insights.sbomify.com/CVE-2025-55315/ Summaries are generated and may contain mistakes; the official description above is the record.