Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0, .NET 5.0 and .NET Core 3.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A vulnerability exists in .NET 6.0, .NET 5.0 and .NET core 3.1 where a malicious client can manipulate cookies and cause a Denial of Service.
Affected software
- Any .NET 6.0 application running on .NET 6.0.4 or earlier.
- Any .NET 5.0 application running .NET 5.0.16 or earlier.
- Any .NET Core 3.1 application running on .NET Core 3.1.24 or earlier.
Affected packages
.NET Core 3.1
| Package name |
Affected versions |
Patched versions |
| Microsoft.Owin.Security.Cookies |
<=4.21 |
4.22 |
| Microsoft.Owin.Security |
<=4.21 |
4.22 |
| Microsoft.AspNetCore.App.Runtime.win-x64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.win-x86 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-arm |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.win-arm |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 |
>=3.0.0,3.1.24 |
3.1.25 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm |
>=3.0.0,3.1.24 |
3.1.25 |
.NET 5.0
| Affected packages |
Affected versions |
Patched versions |
| Microsoft.Owin.Security.Cookies |
<=4.21 |
4.22 |
| Microsoft.AspNetCore.App.Runtime.win-x64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.win-x86 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-arm |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.win-arm |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 |
>=5.0.0,5.0.16 |
5.0.17 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm |
>=5.0.0,5.0.16 |
5.0.17 |
.NET 6.0
| Affected packages |
Affected versions |
Patched versions |
| Microsoft.Owin.Security.Cookies |
<=4.21 |
4.22 |
| Microsoft.AspNetCore.App.Runtime.win-x64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-x64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.win-x86 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.osx-x64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-x64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-arm64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-arm |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.win-arm64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.win-arm |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.osx-arm64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 |
>=6.0.0,6.0.4 |
6.0.5 |
| Microsoft.AspNetCore.App.Runtime.linux-musl-arm |
>=6.0.0,6.0.4 |
6.0.5 |
Patches
.NET 6.0, .NET 5.0 and .NET Core 3.1 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.
Other Details
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 6.0, .NET 5.0 and .NET Core 3.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
A vulnerability exists in .NET 6.0, .NET 5.0 and .NET core 3.1 where a malicious client can manipulate cookies and cause a Denial of Service.
Affected software
Affected packages
.NET Core 3.1
.NET 5.0
.NET 6.0
Patches
If you're using .NET Core 6.0, you should download and install Runtime 6.0.5 or SDK 6.0.105 (for Visual Studio 2022 v17.0) or SDK 6.0.203 (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 5.0.17 or SDK 5.0.214 (for Visual Studio 2019 v16.9) or SDK 5.0.408 (for Visual Studio 2011 v16.11) from https://dotnet.microsoft.com/download/dotnet-core/5.0.
If you're using .NET Core 3.1, you should download and install Runtime 3.1.25 or SDK 3.1.419 (for Visual Studio 2019 v16.9 or Visual Studio 2011 16.11 or Visual Studio 2022 17.0 or Visual Studio 2022 17.1 ) from https://dotnet.microsoft.com/download/dotnet-core/3.1.
.NET 6.0, .NET 5.0 and .NET Core 3.1 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.
Other Details