.NET Denial of Service Vulnerability
Date: 2023-08
Affected: nuget/Microsoft.NetCore.App.Runtime.win-x86, nuget/Microsoft.NetCore.App.Runtime.win-x64, nuget/Microsoft.NetCore.App.Runtime.win-arm64
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2023-38178
CWE: CWE-400
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

# Microsoft Security Advisory CVE-2023-38178: .NET Denial of Service Vulnerability ## <a name="executive-summary"></a>Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 7.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in .NET Kestrel where a malicious client can bypass QUIC stream limit in HTTP/3 in both ASP.NET and .NET runtimes resulting in denial of service. ## Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/268 ### <a name="mitigation-factors"></a>Mitigation factors Microsoft has not identified any mitigating factors for this vulnerability. ## <a name="affected-software"></a>Affected software * Any .NET 7.0 application running on .NET 7.0.9 or earlier. If your application uses the following package versions, ensure you update to the latest version of .NET. ### <a name=".NET 7"></a>.NET 7 Package name | Affected version | Patched version ------------ | ---------------- | ------------------------- [Microsoft.AspNetCore.App.Runtime.win-arm64](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64) | >= 7.0.0, <= 7.0.9 | 7.0.10 [Microsoft.AspNetCore.App.Runtime.win-arm](https://www.nuget.org/packages/Microsoft.AspNetCore.App.Runtime.win-arm64) | >= 7.0.0, <= 7.0.9 | 7.0.10 [Microsoft.AspNetCore.App.Runtime.win-x64]


Mitigations:

Architectural layers (MAESTRO):