Microsoft Security Advisory CVE-2024-38229 | .NET Remote Code Execution Vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

8.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2024-38229: 2.08% estimated exploitation activity in the next 30 days; percentile 81.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Microsoft Security Advisory CVE-2024-38229 | .NET Remote Code Execution Vulnerability <a name="executive-summary"</aExecutive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 8.0 and .NET 9.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in ASP.NET when closing an HTTP/3 stream while application code is writing to the response body, a race condition may lead to use-after-free. Note: HTTP/3 is experimental in .NET 6.0. If you are on .NET 6.0 and using HTTP/3, please upgrade to .NET 8.0.10. .NET 6.0 will not receive a security patch for this vulnerability. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/326 <a name="mitigation-factors"</aMitigation factors HTTP/3 support is not enabled by default in ASP.NET Core applications. For more information on how to configure HTTP/3…

Published by the source

8 Oct 2024, 17:43 UTC

Last modified by the source

6 May 2025, 19:29 UTC

Source last checked

26 Oct 2026, 17:03 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7vw9-cfwx-9gx9

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# Patch Next advisory brief: CVE-2024-38229

Advisory: Microsoft Security Advisory CVE-2024-38229 | .NET Remote Code Execution Vulnerability
IDs: CVE-2024-38229, GHSA-7vw9-cfwx-9gx9
Record: https://patchnext.com/advisories/cve-2024-38229 (revision 1, source checked 26 Oct 2026, 17:03 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.aspnetcore.app.runtime.linux-arm64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.linux-musl-arm64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.osx-x64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.linux-arm 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.win-x86 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.linux-x64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.linux-musl-arm 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.win-arm 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.linux-musl-x64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.osx-arm64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.win-x64 9.0.0-rc.2.24474.3, 8.0.10; microsoft.aspnetcore.app.runtime.win-arm64 9.0.0-rc.2.24474.3, 8.0.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.aspnetcore.app.runtime.linux-arm64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.osx-x64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.linux-arm: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.win-x86: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.linux-x64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.win-arm: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-x64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.osx-arm64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.win-x64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3
- NuGet microsoft.aspnetcore.app.runtime.win-arm64: affected >= 9.0.0-preview.1.24081.5, <= 9.0.0-rc.1.24452.1; >= 8.0.0, <= 8.0.8; fixed in 8.0.10, 9.0.0-rc.2.24474.3

## Suggested inspection (read-only)
- NuGet microsoft.aspnetcore.app.runtime.linux-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.osx-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-arm: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-arm: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-arm: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.linux-musl-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.osx-arm64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-x64: check the installed version with your package manager.
- NuGet microsoft.aspnetcore.app.runtime.win-arm64: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.aspnetcore.app.runtime.linux-arm64, microsoft.aspnetcore.app.runtime.linux-musl-arm64, microsoft.aspnetcore.app.runtime.osx-x64, microsoft.aspnetcore.app.runtime.linux-arm, microsoft.aspnetcore.app.runtime.win-x86, microsoft.aspnetcore.app.runtime.linux-x64, microsoft.aspnetcore.app.runtime.linux-musl-arm, microsoft.aspnetcore.app.runtime.win-arm, microsoft.aspnetcore.app.runtime.linux-musl-x64, microsoft.aspnetcore.app.runtime.osx-arm64, microsoft.aspnetcore.app.runtime.win-x64, microsoft.aspnetcore.app.runtime.win-arm64.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7vw9-cfwx-9gx9 (GitHub-reviewed advisory GHSA-7vw9-cfwx-9gx9 lists affected ranges: NuGet microsoft.aspnetcore.app.runtime.linux-arm >=9.0.0-preview.1.24081.5 =8.0.0 =9.0.0-preview.1.24081.5 =8.0.0 =9.0.0-preview.1.24081.5 =8.0.0 =9.0.0-preview.1.24081.5…)

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