GHSA-3M2R-Q8X3-XMF7

Moderate severity vulnerability that affects Microsoft.AspNetCore.All, Microsoft.AspNetCore.Server.Kestrel.Core, Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions, and Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv

Microsoft made an internal discovery of a security vulnerability in version 2.x of ASP.NET Core where
a specially crafted request can cause excess resource consumption in Kestrel.

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1. What is GHSA-3M2R-Q8X3-XMF7? GHSA-3M2R-Q8X3-XMF7 is a medium-severity security vulnerability in Microsoft.AspNetCore.Server.Kestrel.Core (nuget), affecting versions >= 2.0.0, < 2.0.3. It is fixed in 2.0.3, 2.0.8.
2. Which packages are affected by GHSA-3M2R-Q8X3-XMF7?
   • Microsoft.AspNetCore.Server.Kestrel.Core (nuget) (versions >= 2.0.0, < 2.0.3)
   • Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions (nuget) (versions >= 2.0.0, < 2.0.3)
   • Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv (nuget) (versions >= 2.0.0, < 2.0.3)
   • Microsoft.AspNetCore.All (nuget) (versions >= 2.0.0, < 2.0.8)
3. Is there a fix for GHSA-3M2R-Q8X3-XMF7? Yes. GHSA-3M2R-Q8X3-XMF7 is fixed in 2.0.3, 2.0.8. Upgrade to this version or later.
4. Is GHSA-3M2R-Q8X3-XMF7 exploitable, and should I be worried? Whether GHSA-3M2R-Q8X3-XMF7 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether GHSA-3M2R-Q8X3-XMF7 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix GHSA-3M2R-Q8X3-XMF7?
   • Upgrade Microsoft.AspNetCore.Server.Kestrel.Core to 2.0.3 or later
   • Upgrade Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions to 2.0.3 or later
   • Upgrade Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv to 2.0.3 or later
   • Upgrade Microsoft.AspNetCore.All to 2.0.8 or later

Other vulnerabilities in Microsoft.AspNetCore.Server.Kestrel.Core