ghsa-5rrx-jjjq-q2r5

Vulnerability from github

Published

2025-10-14 20:32

Modified

2025-10-14 22:06

Severity ?

9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Summary

Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability

Details

Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 10.0 , ASP.NET Core 9.0 , ASP.NET Core 8.0, and ASP.NET Core 2.3. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.

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.

Discussion

Discussion for this issue can be found at https://github.com/dotnet/announcements/issues/372

Mitigation factors

Microsoft has not identified any mitigating factors for this vulnerability.

Affected software

Any ASP.NET Core 10.0 application running on ASP.NET Core 10.0.0-rc.1.25451.107 or earlier.
Any ASP.NET Core 9.0 application running on ASP.NET Core 9.0.9 or earlier.
Any ASP.NET Core application running on ASP.NET Core 8.0.20 or earlier.
Any ASP.NET Core 2.x application consuming the package Microsoft.AspNetCore.Server.Kestrel.Core version 2.3.0 or earlier.

Affected Packages

The vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.Server.Kestrel.Core | <= 2.3.0 | 2.3.6

ASP.NET Core 10

Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- Microsoft.AspNetCore.App.Runtime.linux-arm | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.linux-arm64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.linux-musl-arm | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.linux-x64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.osx-arm64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.osx-x64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.win-arm | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.win-arm64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.win-x64 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107 Microsoft.AspNetCore.App.Runtime.win-x86 | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107

ASP.NET Core 9

ASP.NET Core 8

Advisory FAQ

How do I know if I am affected?

If you have a runtime or SDK with a version listed, or an affected package listed in affected software or affected packages, you're exposed to the vulnerability.

How do I fix the issue?

To fix the issue please install the latest version of .NET 9.0 and .NET 8.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.
If your application references the vulnerable package, update the package reference to the patched version.
You can list the versions you have installed by running the dotnet --info command. You will see output like the following;

``` .NET SDK: Version: 9.0.100 Commit: 59db016f11 Workload version: 9.0.100-manifests.3068a692 MSBuild version: 17.12.7+5b8665660

Runtime Environment: OS Name: Mac OS X OS Version: 15.2 OS Platform: Darwin RID: osx-arm64 Base Path: /usr/local/share/dotnet/sdk/9.0.100/

.NET workloads installed: There are no installed workloads to display. Configured to use loose manifests when installing new manifests.

Host: Version: 9.0.0 Architecture: arm64 Commit: 9d5a6a9aa4

.NET SDKs installed: 9.0.100 [/usr/local/share/dotnet/sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 9.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App] Microsoft.NETCore.App 9.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found: x64 [/usr/local/share/dotnet] registered at [/etc/dotnet/install_location_x64]

Environment variables: Not set

global.json file: Not found

Learn more: https://aka.ms/dotnet/info

Download .NET: https://aka.ms/dotnet/download ```

If you're using .NET 8.0, you should download and install .NET 8.0.21 Runtime or .NET 8.0.318 SDK (for Visual Studio 2022 v17.10 latest update) from https://dotnet.microsoft.com/download/dotnet-core/8.0.
If you're using .NET 9.0, you should download and install .NET 9.0.10 Runtime or .NET 9.0.111 SDK (for Visual Studio 2022 v17.12 latest update) from https://dotnet.microsoft.com/download/dotnet-core/9.0.
If you're using .NET 10.0, you should download and install .NET 10.0.0-rc.2.25476.107 Runtime or .NET 10.0.100-rc.2.25476.107 SDK (for Visual Studio 2022 v17.12 latest update) from https://dotnet.microsoft.com/download/dotnet-core/10.0.
If you're using Microsoft.AspNetCore.Server.Kestrel.Core nuget package, update to the latest version 2.3.6 using either of the following methods:
- Using the NuGet Package Manager UI in Visual Studio: - Open your project in Visual Studio. - Right-click on your project in Solution Explorer and select "Manage NuGet Packages..." or navigate to "Project > Manage NuGet Packages". - In the NuGet Package Manager window, select the "Updates" tab. This tab lists packages with available updates from your configured package sources. - Select the package(s) you wish to update. You can choose a specific version from the dropdown or update to the latest available version. - Click the "Update" button.
- Using the NuGet Package Manager Console in Visual Studio: - Open your project in Visual Studio. - Navigate to "Tools > NuGet Package Manager > Package Manager Console". - To update a specific package to its latest version, use the Update-Package command: Code:
```
    Update-Package -Id Microsoft.AspNetCore.Server.Kestrel.Core
```
- Using the .NET CLI (Command Line Interface): Open a terminal or command prompt in your project's directory. To update a specific package to its latest version: Code:
```
    dotnet add package Microsoft.AspNetCore.Server.Kestrel.Core
```

Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.

Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If you have found a potential security issue in .NET 8.0, .NET 9.0 or .NET 10.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core & .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/aspnetcore. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

Acknowledgement

Sid

CVE-2025-55315

Revisions

V1.0 (October 14, 2025): Advisory published.

Version 1.0

Last Updated 2025-10-14

Show details on source website

JSON

To clipboard

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        "last_known_affected_version_range": "\u003c= 8.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.App.Runtime.osx-arm64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.App.Runtime.osx-x64"
      },
      "ranges": [
        {
          "events": [
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    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.App.Runtime.win-arm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.App.Runtime.win-arm64"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "8.0.0"
            },
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              "fixed": "8.0.21"
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      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.20"
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        "last_known_affected_version_range": "\u003c= 8.0.20"
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      },
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          ],
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      ]
    }
  ],
  "aliases": [
    "CVE-2025-55315"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-14T20:32:06Z",
    "nvd_published_at": "2025-10-14T17:15:44Z",
    "severity": "CRITICAL"
  },
  "details": "# Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability\n\n## \u003ca name=\"executive-summary\"\u003e\u003c/a\u003eExecutive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 10.0 , ASP.NET Core 9.0 , ASP.NET Core 8.0, and ASP.NET Core 2.3. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability.\n\nInconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.\n\n## Discussion\n\nDiscussion for this issue can be found at https://github.com/dotnet/announcements/issues/372\n\n### \u003ca name=\"mitigation-factors\"\u003e\u003c/a\u003eMitigation factors\n\nMicrosoft has not identified any mitigating factors for this vulnerability.\n\n## \u003ca name=\"affected-software\"\u003e\u003c/a\u003eAffected software\n\n* Any ASP.NET Core 10.0 application running on ASP.NET Core 10.0.0-rc.1.25451.107 or earlier.\n* Any ASP.NET Core 9.0 application running on ASP.NET Core 9.0.9 or earlier.\n* Any ASP.NET Core application running on ASP.NET Core 8.0.20 or earlier.\n* Any ASP.NET Core 2.x application consuming the package Microsoft.AspNetCore.Server.Kestrel.Core version 2.3.0 or earlier.\n\n## \u003ca name=\"affected-packages\"\u003e\u003c/a\u003eAffected Packages\nThe vulnerability affects any Microsoft .NET Core project if it uses any of affected packages versions listed below\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.Server.Kestrel.Core](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.Kestrel.Core) | \u003c= 2.3.0  | 2.3.6\n\n### \u003ca name=\"ASP.NET Core 10\"\u003e\u003c/a\u003eASP.NET Core 10\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | 10.0.0-rc.1.25451.107 | 10.0.0-rc.2.25502.107\n\n### \u003ca name=\"ASP.NET Core 9\"\u003e\u003c/a\u003eASP.NET Core 9\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | \u003e= 9.0.0, \u003c= 9.0.9 | 9.0.10\n\n\n### \u003ca name=\"ASP.NET Core 8\"\u003e\u003c/a\u003eASP.NET Core 8\nPackage name | Affected version | Patched version\n------------ | ---------------- | -------------------------\n[Microsoft.AspNetCore.App.Runtime.linux-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm)               | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.linux-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-arm64)           | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm)     | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.linux-musl-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-arm64) | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.linux-musl-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-musl-x64)     | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.linux-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.linux-x64)               | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.osx-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-arm64)               | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.osx-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.osx-x64)                   | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm)                   | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64)               | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.win-x64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x64)                   | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n[Microsoft.AspNetCore.App.Runtime.win-x86](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-x86)                   | \u003e= 8.0.0, \u003c= 8.0.20 | 8.0.21\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf you have a runtime or SDK with a version listed, or an affected package listed in [affected software](#affected-packages) or [affected packages](#affected-software), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET 9.0 and .NET 8.0. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET  SDKs.\n2. If your application references the vulnerable package, update the package reference to the patched version.\n\n* You can list the versions you have installed by running the `dotnet --info` command. You will see output like the following;\n\n```\n.NET SDK:\n Version:           9.0.100\n Commit:            59db016f11\n Workload version:  9.0.100-manifests.3068a692\n MSBuild version:   17.12.7+5b8665660\n\nRuntime Environment:\n OS Name:     Mac OS X\n OS Version:  15.2\n OS Platform: Darwin\n RID:         osx-arm64\n Base Path:   /usr/local/share/dotnet/sdk/9.0.100/\n\n.NET workloads installed:\nThere are no installed workloads to display.\nConfigured to use loose manifests when installing new manifests.\n\nHost:\n  Version:      9.0.0\n  Architecture: arm64\n  Commit:       9d5a6a9aa4\n\n.NET SDKs installed:\n  9.0.100 [/usr/local/share/dotnet/sdk]\n\n.NET runtimes installed:\n  Microsoft.AspNetCore.App 9.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]\n  Microsoft.NETCore.App 9.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]\n\nOther architectures found:\n  x64   [/usr/local/share/dotnet]\n    registered at [/etc/dotnet/install_location_x64]\n\nEnvironment variables:\n  Not set\n\nglobal.json file:\n  Not found\n\nLearn more:\n  https://aka.ms/dotnet/info\n\nDownload .NET:\n  https://aka.ms/dotnet/download\n```\n\n* If you\u0027re using .NET 8.0, you should download and install .NET 8.0.21  Runtime or .NET 8.0.318 SDK (for Visual Studio 2022 v17.10 latest update) from https://dotnet.microsoft.com/download/dotnet-core/8.0.\n* If you\u0027re using .NET 9.0, you should download and install .NET 9.0.10  Runtime or .NET 9.0.111 SDK (for Visual Studio 2022 v17.12 latest update) from https://dotnet.microsoft.com/download/dotnet-core/9.0.\n* If you\u0027re using .NET 10.0, you should download and install .NET 10.0.0-rc.2.25476.107 Runtime or .NET 10.0.100-rc.2.25476.107 SDK (for Visual Studio 2022 v17.12 latest update) from https://dotnet.microsoft.com/download/dotnet-core/10.0.\n* If you\u0027re using [Microsoft.AspNetCore.Server.Kestrel.Core](https://www.nuget.org/packages/Microsoft.AspNetCore.Server.Kestrel.Core) nuget package, update to the latest version 2.3.6 using either of the following methods:\n\n    * Using the NuGet Package Manager UI in Visual Studio:\n            - Open your project in Visual Studio.\n            - Right-click on your project in Solution Explorer and select \"Manage NuGet Packages...\" or navigate to \"Project \u003e Manage NuGet Packages\".\n            - In the NuGet Package Manager window, select the \"Updates\" tab. This tab lists packages with available updates from your configured package sources.\n            - Select the package(s) you wish to update. You can choose a specific version from the dropdown or update to the latest available version.\n            - Click the \"Update\" button.\n\n    * Using the NuGet Package Manager Console in Visual Studio:\n            - Open your project in Visual Studio.\n            - Navigate to \"Tools \u003e NuGet Package Manager \u003e Package Manager Console\".\n            - To update a specific package to its latest version, use the Update-Package command:\n                Code:\n\n                Update-Package -Id Microsoft.AspNetCore.Server.Kestrel.Core\n\n    * Using the .NET CLI (Command Line Interface):\n            Open a terminal or command prompt in your project\u0027s directory.\n            To update a specific package to its latest version:\n                Code:\n\n                dotnet add package Microsoft.AspNetCore.Server.Kestrel.Core\n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in .NET 8.0, .NET 9.0 or .NET 10.0, please email details to secure@microsoft.com. Reports may qualify for the Microsoft .NET Core \u0026 .NET 5 Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at \u003chttps://aka.ms/corebounty\u003e.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/aspnetcore. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n### External Links\n\n### Acknowledgement\nSid\n\n[CVE-2025-55315]( https://www.cve.org/CVERecord?id=CVE-2025-55315)\n\n### Revisions\n\nV1.0 (October 14, 2025): Advisory published.\n\n_Version 1.0_\n\n_Last Updated 2025-10-14_",
  "id": "GHSA-5rrx-jjjq-q2r5",
  "modified": "2025-10-14T22:06:17Z",
  "published": "2025-10-14T20:32:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-5rrx-jjjq-q2r5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55315"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/announcements/issues/372"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dotnet/aspnetcore"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability"
}

CVE-2025-55315 (GCVE-0-2025-55315)

Vulnerability from cvelistv5

Published

2025-10-14 17:00

Modified

2025-10-15 21:01

Severity ?

9.9 (Critical) - 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

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Summary

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.

References

▼	URL	Tags
	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315	vendor-advisory

Impacted products

Vendor

Product

Version

▼

Microsoft

ASP.NET Core 8.0

Version: 8.0 < 8.0.21

Microsoft	ASP.NET Core 9.0	Version: 9.0 < 9.0.10
Microsoft	ASP.NET Core 2.3	Version: 2.3 < 2.3.6
Microsoft	Microsoft Visual Studio 2022 version 17.12	Version: 17.12.0 < 17.12.13
Microsoft	Microsoft Visual Studio 2022 version 17.10	Version: 17.10.0 < 17.10.20
Microsoft	Microsoft Visual Studio 2022 version 17.14	Version: 17.14.0 < 17.14.17

Show details on NVD website

JSON

To clipboard

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          ]
        },
        {
          "platforms": [
            "Unknown"
          ],
          "product": "Microsoft Visual Studio 2022 version 17.14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.14.17",
              "status": "affected",
              "version": "17.14.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "8.0.21",
                  "versionStartIncluding": "8.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "9.0.10",
                  "versionStartIncluding": "9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:asp.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.3.6",
                  "versionStartIncluding": "2.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.12.13",
                  "versionStartIncluding": "17.12.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.10.20",
                  "versionStartIncluding": "17.10.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "17.14.17",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2025-10-14T07:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "vectorString": "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",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-15T21:01:06.376Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "ASP.NET Security Feature Bypass Vulnerability",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315"
        }
      ],
      "title": "ASP.NET Security Feature Bypass Vulnerability"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "microsoft",
    "cveId": "CVE-2025-55315",
    "datePublished": "2025-10-14T17:00:10.371Z",
    "dateReserved": "2025-08-12T20:19:59.422Z",
    "dateUpdated": "2025-10-15T21:01:06.376Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

ghsa-5rrx-jjjq-q2r5

Vulnerability from github

Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability

Executive summary

Discussion

Mitigation factors

Affected software

Affected Packages

ASP.NET Core 10

ASP.NET Core 9

ASP.NET Core 8

Advisory FAQ

How do I know if I am affected?

How do I fix the issue?

Other Information

Reporting Security Issues

Support

Disclaimer

External Links

Acknowledgement

Revisions

CVE-2025-55315 (GCVE-0-2025-55315)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature