# CVE-2019-0564: Denial of service in ASP.NET Core

Source: https://junglewise.ai/threats/cve-2019-0564-denial-of-service-in-asp-net-core  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-05-14  
License: CC BY 4.0 with a link back

CVE-2019-0564 · Severity: low · CVSS 3 · Published 2022-05-14

Denial of service in ASP.NET Core

Technologies: [Microsoft.AspNetCore.All (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-all), [Microsoft.AspNetCore.App (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-app), [Microsoft.AspNetCore.Server.Kestrel.Core (NuGet)](https://junglewise.ai/threats/technologies/microsoft-aspnetcore-server-kestrel-core), [Microsoft.NETCore.App (NuGet)](https://junglewise.ai/threats/technologies/microsoft-netcore-app). Vendors: [NuGet](https://junglewise.ai/threats/vendors/nuget).

## Quick answers

**Is CVE-2019-0564 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2019-0564 being exploited in the wild.

**How severe is CVE-2019-0564?** Low severity, with a CVSS score of 3, published 14 May 2022.

**Which products and versions are affected?** Microsoft.AspNetCore.All (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1; Microsoft.AspNetCore.App (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1; Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) ECOSYSTEM:introduced=2.1.0,fixed=2.1.7; Microsoft.AspNetCore.WebSockets (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1; and 2 more.

**Is there a fix for CVE-2019-0564?** Yes. Microsoft.AspNetCore.All (NuGet): upgrade to 2.2.1 or later; Microsoft.AspNetCore.App (NuGet): upgrade to 2.2.1 or later; Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): upgrade to 2.1.7 or later; Microsoft.AspNetCore.WebSockets (NuGet): upgrade to 2.2.1 or later; Microsoft.NETCore.App (NuGet): upgrade to 2.2.1 or later; System.Net.WebSockets.WebSocketProtocol (NuGet): upgrade to 4.5.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2019-0564?** Check whether you run Microsoft.AspNetCore.All (NuGet), Microsoft.AspNetCore.App (NuGet), Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Microsoft.AspNetCore.All (NuGet): upgrade to 2.2.1 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.All --version 2.2.1
  ```

- Microsoft.AspNetCore.App (NuGet): upgrade to 2.2.1 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.App --version 2.2.1
  ```

- Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): upgrade to 2.1.7 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.Server.Kestrel.Core --version 2.1.7
  ```

- Microsoft.AspNetCore.WebSockets (NuGet): upgrade to 2.2.1 or later

  ```sh
  dotnet add package Microsoft.AspNetCore.WebSockets --version 2.2.1
  ```

- Microsoft.NETCore.App (NuGet): upgrade to 2.2.1 or later

  ```sh
  dotnet add package Microsoft.NETCore.App --version 2.2.1
  ```

- System.Net.WebSockets.WebSocketProtocol (NuGet): upgrade to 4.5.3 or later

  ```sh
  dotnet add package System.Net.WebSockets.WebSocketProtocol --version 4.5.3
  ```


## Affected products

- Microsoft.AspNetCore.All (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1
- Microsoft.AspNetCore.App (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1
- Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) ECOSYSTEM:introduced=2.1.0,fixed=2.1.7
- Microsoft.AspNetCore.WebSockets (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1
- Microsoft.NETCore.App (NuGet) ECOSYSTEM:introduced=2.2.0,fixed=2.2.1
- System.Net.WebSockets.WebSocketProtocol (NuGet) ECOSYSTEM:introduced=4.5.0,fixed=4.5.3

## Identifiers

- CVE-2019-0564
- GHSA-6px8-22w5-w334

## Related threats

- [Microsoft Security Advisory : .NET Security Feature Bypass Vulnerability](https://junglewise.ai/threats/cve-2025-55315-microsoft-security-advisory-net-security-feature-bypass)
- [.NET Core Information Disclosure Vulnerability](https://junglewise.ai/threats/cve-2021-34485-net-core-information-disclosure-vulnerability)
- [Denial of service in .NET core](https://junglewise.ai/threats/cve-2021-1721-denial-of-service-in-net-core)
- [ASP.NET Core and Visual Studio Denial of Service Vulnerability](https://junglewise.ai/threats/cve-2021-1723-asp-net-core-and-visual-studio-denial-of-service-vulnerability)
- [Cookie parsing failure](https://junglewise.ai/threats/cve-2020-1045-cookie-parsing-failure)