Microsoft Security Advisory CVE-2024-38095 | .NET Denial of Service Vulnerability

Exploitation

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

CVSS 4.0

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

EPSS

• CVE-2024-38095: 2.74% estimated exploitation activity in the next 30 days; percentile 86.19 (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-2024-38095 | .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 6.0 and .NET 8.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A Vulnerability exists when System.Formats.Asn1 in .NET parses an X.509 certificate or collection of certificates, a malicious certificate can result in excessive CPU consumption on all platforms result in Denial of Service. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/312 <a name="mitigation-factors"</aMitigation factors Microsoft has not identified any mitigating factors for this vulnerability. <a name="affected-software"</aAffected software Any .NET 6.0 application running on .NET 6.0.31 or earlier. Any .NET 8.0 application running on .NET 8.0.6 or earlier. <a…

Published by the source

9 Jul 2024, 21:14 UTC

Last modified by the source

8 Aug 2024, 05:06 UTC

Source last checked

26 Oct 2026, 17:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-447r-wph3-92pm

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# Patch Next advisory brief: CVE-2024-38095

Advisory: Microsoft Security Advisory CVE-2024-38095 | .NET Denial of Service Vulnerability
IDs: CVE-2024-38095, GHSA-447r-wph3-92pm
Record: https://patchnext.com/advisories/cve-2024-38095 (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 8.7)
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 8.0.7, 6.0.32; system.formats.asn1 8.0.1, 6.0.1; microsoft.netcore.app.runtime.win-arm64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-musl-x64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-arm64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-arm 8.0.7, 6.0.32; microsoft.netcore.app.runtime.osx-x64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-x64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.osx-arm64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-musl-arm 8.0.7, 6.0.32; microsoft.netcore.app.runtime.win-arm 8.0.7, 6.0.32; microsoft.netcore.app.runtime.linux-musl-arm64 8.0.7, 6.0.32; microsoft.netcore.app.runtime.win-x64 8.0.7, 6.0.32. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.netcore.app.runtime.win-x86: affected >= 6.0.0, <= 6.0.31; >= 8.0.0, <= 8.0.6; fixed in 6.0.32, 8.0.7
- NuGet system.formats.asn1: affected >= 5.0.0-preview.7.20364.11, < 6.0.1; >= 7.0.0-preview.1.22076.8, < 8.0.1; fixed in 8.0.1, 6.0.1
- NuGet microsoft.netcore.app.runtime.win-arm64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-musl-x64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-arm64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-arm: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.osx-x64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-x64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.osx-arm64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-musl-arm: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.win-arm: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.linux-musl-arm64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7
- NuGet microsoft.netcore.app.runtime.win-x64: affected >= 8.0.0, <= 8.0.6; >= 6.0.0, <= 6.0.31; fixed in 6.0.32, 8.0.7

## Suggested inspection (read-only)
- NuGet microsoft.netcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet system.formats.asn1: 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, system.formats.asn1, 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-447r-wph3-92pm (GitHub-reviewed advisory GHSA-447r-wph3-92pm lists affected ranges: NuGet microsoft.netcore.app.runtime.linux-arm >=8.0.0 =6.0.0 =8.0.0 =6.0.0 =8.0.0 =6.0.0 =8.0.0 =6.0.0 =8.0.0 =6.0.0 <=6.0.31; NuGet…)

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