.NET Denial of Service Vulnerability

Microsoft.AspNetCore.App.Runtime.win-x64 Updated 02 Oct 2025

Summary

21/10/2022

Disclosed on

CVE-2022-21986

CVE

Yes i

Fix available

High

Severity

7.5

CVSS Score

CVE-2022-21986: .NET Denial of Service Vulnerability. Affects Microsoft.AspNetCore.App.Runtime.win-x64 across 2 version ranges.

>= 5.0.0, < 5.0.14 >= 6.0.0, < 6.0.2

Fixed in 5.0.14 or 6.0.2, depending on the release line you run. How to fix ↓

Also tracked for

dotnet-sdk · Bitnami
dotnet · Bitnami

The same CVE-2022-21986 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.

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Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0 and .NET 5.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A Denial of Service vulnerability exists in .NET 6.0 and .NET 5.0 when the Kestrel web server processes certain HTTP/2 and HTTP/3 requests.

Affected Software

Any .NET 6.0 application running on .NET 6.0.1 or lower.
Any .NET 5.0 application running on .NET 5.0.13 or lower.

Patches

To fix the issue, please install the latest version of .NET 6.0 or .NET 5.0. 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 you're using .NET Core 6.0, you should download and install Runtime 6.0.2 or SDK 6.0.102 (for Visual Studio 2022 v17.1) from https://dotnet.microsoft.com/download/dotnet-core/6.0.
If you're using .NET 5.0, you should download and install Runtime 5.0.14 or SDK 5.0.114 (for Visual Studio 2019 v16.8) or SDK 5.0.405 (for Visual Studio 2011 v16.11) from https://dotnet.microsoft.com/download/dotnet-core/5.0.

.NET 6.0 and .NET 5.0 updates are also available from Microsoft Update. To access this either type "Check for updates" in your Windows search, or open Settings, choose Update & Security and then click Check for Updates.