Microsoft Security Advisory CVE-2024-21392: .NET Denial of Service Vulnerability

Exploitation

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

CVSS

7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2024-21392: 3.09% estimated exploitation activity in the next 30 days; percentile 87.73 (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-2024-21392: .NET Denial of Service Vulnerability <a name="executive-summary"</aExecutive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 7.0 and .NET 8.0 . This advisory also provides guidance on what developers can do to update their applications to address this vulnerability. A vulnerability exists in .NET where specially crafted requests may cause a resource leak, leading to a Denial of Service Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/299 <a name="mitigation-factors"</aMitigation factors Microsoft has not identified any mitigating factors for this vulnerability. <a name="affected-software"</aAffected software Any .NET 7.0 application running on .NET 7.0.16 or earlier. Any .NET 8.0 application running on .NET 8.0.2 or earlier. <a name="affected-packages"</aAffected Packages The vulnerability affects any Microsoft .NET Core project…

Published by the source

12 Mar 2024, 20:07 UTC

Last modified by the source

18 Mar 2024, 19:07 UTC

Source last checked

26 Oct 2026, 17:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5fxj-whcv-crrc

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-21392

Advisory: Microsoft Security Advisory CVE-2024-21392: .NET Denial of Service Vulnerability
IDs: CVE-2024-21392, GHSA-5fxj-whcv-crrc
Record: https://patchnext.com/advisories/cve-2024-21392 (revision 1, source checked 26 Oct 2026, 17:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.netcore.app.runtime.win-x86 8.0.3, 7.0.17; microsoft.netcore.app.runtime.win-arm64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-musl-x64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-arm64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-arm 8.0.3, 7.0.17; microsoft.netcore.app.runtime.osx-x64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-x64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.osx-arm64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-musl-arm 8.0.3, 7.0.17; microsoft.netcore.app.runtime.win-arm 8.0.3, 7.0.17; microsoft.netcore.app.runtime.linux-musl-arm64 8.0.3, 7.0.17; microsoft.netcore.app.runtime.win-x64 8.0.3, 7.0.17. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.netcore.app.runtime.win-x86: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.win-arm64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-musl-x64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-arm64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-arm: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.osx-x64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-x64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.osx-arm64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-musl-arm: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.win-arm: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.linux-musl-arm64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17
- NuGet microsoft.netcore.app.runtime.win-x64: affected >= 8.0.0, <= 8.0.2; >= 7.0.0-preview.1.22076.8, <= 7.0.16; fixed in 8.0.3, 7.0.17

## Suggested inspection (read-only)
- NuGet microsoft.netcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.osx-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-x64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.osx-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.linux-musl-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-x64: 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.netcore.app.runtime.win-x86, microsoft.netcore.app.runtime.win-arm64, microsoft.netcore.app.runtime.linux-musl-x64, microsoft.netcore.app.runtime.linux-arm64, microsoft.netcore.app.runtime.linux-arm, microsoft.netcore.app.runtime.osx-x64, microsoft.netcore.app.runtime.linux-x64, microsoft.netcore.app.runtime.osx-arm64, microsoft.netcore.app.runtime.linux-musl-arm, microsoft.netcore.app.runtime.win-arm, microsoft.netcore.app.runtime.linux-musl-arm64, microsoft.netcore.app.runtime.win-x64.
- 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-5fxj-whcv-crrc (GitHub-reviewed advisory GHSA-5fxj-whcv-crrc lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=8.0.0 =7.0.0-preview.1.22076.8 =8.0.0 =7.0.0-preview.1.22076.8 =8.0.0 =7.0.0-preview.1.22076.8 =8.0.0 =7.0.0-preview.1.22076.8 <=7.0.16; NuGet…)

Commands are suggestions: review each one before running it.