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CVE-2023-38180: .NET Denial of Service Vulnerability

August 9, 2023 (updated October 22, 2025)

Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core 2.1, .NET 6.0, and .NET 7.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A vulnerability exists in Kestrel where, on detecting a potentially malicious client, Kestrel will sometimes fail to disconnect it, resulting in denial of service.

References

  • github.com/advisories/GHSA-vmch-3w2x-vhgq
  • github.com/dotnet/runtime
  • github.com/dotnet/runtime/issues/90170
  • github.com/dotnet/runtime/security/advisories/GHSA-vmch-3w2x-vhgq
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CL2L4WE5QRT7WEXANYXSKSU43APC5N2V
  • lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NWVZFKTLNMNKPZ755EMRYIA6GHFOWGKY
  • msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38180
  • nvd.nist.gov/vuln/detail/CVE-2023-38180
  • www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-38180

Code Behaviors & Features

Detect and mitigate CVE-2023-38180 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →

Affected versions

All versions before 2.1.40

Fixed versions

  • 2.1.40

Solution

Upgrade to version 2.1.40 or above.

Impact 7.5 HIGH

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

Learn more about CVSS

Weakness

  • CWE-400: Uncontrolled Resource Consumption

Source file

nuget/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets/CVE-2023-38180.yml

Spotted a mistake? Edit the file on GitLab.

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