.NET Denial of Service Vulnerability
Description
.NET Denial of Service Vulnerability
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
A denial-of-service vulnerability in ASP.NET Core SignalR allows a malicious client to crash the server by sending crafted requests.
Vulnerability
Description
CVE-2024-21386 is a denial-of-service vulnerability in ASP.NET Core applications that use SignalR. The root cause lies in how the SignalR server processes certain client requests; a malicious client can trigger an unhandled condition that leads to a server crash, resulting in a denial of service [1]. The vulnerability affects .NET 6.0 (up to 6.0.26), .NET 7.0 (up to 7.0.15), and .NET 8.0 (up to 8.0.1) [1].
Exploitation
An attacker does not need authentication to trigger this vulnerability; any client that can connect to a vulnerable SignalR hub can send specially crafted messages that exploit the flaw [1]. The attack is network-based and requires no special privileges, making it relatively easy for a remote attacker to disrupt service. Microsoft has stated that no mitigating factors exist for this issue [1].
Impact
Successful exploitation allows an attacker to cause the ASP.NET Core server to crash, leading to a temporary denial of service for all users of the affected application. The impact is limited to availability; there is no risk of data compromise or code execution [1].
Mitigation
Microsoft has released patched versions of the affected packages [1]. Developers should update their applications to .NET 6.0.27, .NET 7.0.16, or .NET 8.0.2 (or later) to remediate the vulnerability [1]. No workarounds have been provided. The advisory is also tracked under GHSA-g74q-5xw3-j7q9 [1].
AI Insight generated on May 20, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Microsoft.AspNetCore.App.Runtime.linux-armNuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-x64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.osx-x64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.win-armNuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.win-arm64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.win-x64NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.win-x86NuGet | < 6.0.27 | 6.0.27 |
Microsoft.AspNetCore.App.Runtime.linux-armNuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-x64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.osx-x64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.win-armNuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.win-arm64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.win-x64NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.win-x86NuGet | >= 7.0.0, < 7.0.16 | 7.0.16 |
Microsoft.AspNetCore.App.Runtime.linux-armNuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.linux-x64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.osx-x64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.win-armNuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.win-arm64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.win-x64NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Microsoft.AspNetCore.App.Runtime.win-x86NuGet | >= 8.0.0, < 8.0.2 | 8.0.2 |
Affected products
52- osv-coords46 versionspkg:bitnami/aspnet-corepkg:nuget/microsoft.aspnetcore.app.runtime.linux-armpkg:nuget/microsoft.aspnetcore.app.runtime.linux-arm64pkg:nuget/microsoft.aspnetcore.app.runtime.linux-musl-armpkg:nuget/microsoft.aspnetcore.app.runtime.linux-musl-arm64pkg:nuget/microsoft.aspnetcore.app.runtime.linux-musl-x64pkg:nuget/microsoft.aspnetcore.app.runtime.linux-x64pkg:nuget/microsoft.aspnetcore.app.runtime.osx-arm64pkg:nuget/microsoft.aspnetcore.app.runtime.osx-x64pkg:nuget/microsoft.aspnetcore.app.runtime.win-armpkg:nuget/microsoft.aspnetcore.app.runtime.win-arm64pkg:nuget/microsoft.aspnetcore.app.runtime.win-x64pkg:nuget/microsoft.aspnetcore.app.runtime.win-x86pkg:rpm/almalinux/aspnetcore-runtime-6.0pkg:rpm/almalinux/aspnetcore-runtime-7.0pkg:rpm/almalinux/aspnetcore-runtime-8.0pkg:rpm/almalinux/aspnetcore-runtime-dbg-8.0pkg:rpm/almalinux/aspnetcore-targeting-pack-6.0pkg:rpm/almalinux/aspnetcore-targeting-pack-7.0pkg:rpm/almalinux/aspnetcore-targeting-pack-8.0pkg:rpm/almalinux/dotnetpkg:rpm/almalinux/dotnet-apphost-pack-6.0pkg:rpm/almalinux/dotnet-apphost-pack-7.0pkg:rpm/almalinux/dotnet-apphost-pack-8.0pkg:rpm/almalinux/dotnet-hostpkg:rpm/almalinux/dotnet-hostfxr-6.0pkg:rpm/almalinux/dotnet-hostfxr-7.0pkg:rpm/almalinux/dotnet-hostfxr-8.0pkg:rpm/almalinux/dotnet-runtime-6.0pkg:rpm/almalinux/dotnet-runtime-7.0pkg:rpm/almalinux/dotnet-runtime-8.0pkg:rpm/almalinux/dotnet-runtime-dbg-8.0pkg:rpm/almalinux/dotnet-sdk-6.0pkg:rpm/almalinux/dotnet-sdk-6.0-source-built-artifactspkg:rpm/almalinux/dotnet-sdk-7.0pkg:rpm/almalinux/dotnet-sdk-7.0-source-built-artifactspkg:rpm/almalinux/dotnet-sdk-8.0pkg:rpm/almalinux/dotnet-sdk-8.0-source-built-artifactspkg:rpm/almalinux/dotnet-sdk-dbg-8.0pkg:rpm/almalinux/dotnet-targeting-pack-6.0pkg:rpm/almalinux/dotnet-targeting-pack-7.0pkg:rpm/almalinux/dotnet-targeting-pack-8.0pkg:rpm/almalinux/dotnet-templates-6.0pkg:rpm/almalinux/dotnet-templates-7.0pkg:rpm/almalinux/dotnet-templates-8.0pkg:rpm/almalinux/netstandard-targeting-pack-2.1
>= 6.0.0, < 6.0.27+ 45 more
- (no CPE)range: >= 6.0.0, < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 8.0.102-2.el8_9
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 6.0.127-1.el9_3
- (no CPE)range: < 6.0.127-1.el9_3
- (no CPE)range: < 7.0.116-1.el9_3
- (no CPE)range: < 7.0.116-1.el9_3
- (no CPE)range: < 8.0.102-2.el8_9
- (no CPE)range: < 8.0.102-2.el8_9
- (no CPE)range: < 8.0.102-2.el8_9
- (no CPE)range: < 6.0.27-1.el9_3
- (no CPE)range: < 7.0.16-1.el9_3
- (no CPE)range: < 8.0.2-2.el8_9
- (no CPE)range: < 6.0.127-1.el9_3
- (no CPE)range: < 7.0.116-1.el9_3
- (no CPE)range: < 8.0.102-2.el8_9
- (no CPE)range: < 8.0.102-2.el8_9
- Microsoft/ASP.NET Core 6.0v5Range: 6.0
- Microsoft/ASP.NET Core 7.0v5Range: 7.0.0
- Microsoft/ASP.NET Core 8.0v5Range: 8.0
- Microsoft/Microsoft Visual Studio 2022 version 17.4v5Range: 17.4.0
- Microsoft/Microsoft Visual Studio 2022 version 17.6v5Range: 17.6.0
- Microsoft/Microsoft Visual Studio 2022 version 17.8v5Range: 17.8.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-g74q-5xw3-j7q9ghsaADVISORY
- msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21386ghsavendor-advisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2024-21386ghsaADVISORY
- github.com/dotnet/aspnetcore/security/advisories/GHSA-g74q-5xw3-j7q9ghsaWEB
News mentions
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