CVE-2025-55315: Microsoft Security Advisory : .NET Security Feature Bypass Vulnerability

CVE-2025-55315 · Severity: low · CVSS 3.1 · Published 2025-10-14

Microsoft Security Advisory CVE-2025-55315: .NET Security Feature Bypass Vulnerability

Technologies: Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-arm (NuGet), Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet), Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet), Microsoft.AspNetCore.Server.Kestrel.Core (NuGet). Vendors: NuGet.

Quick answers

Is CVE-2025-55315 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-55315 being exploited in the wild.
How severe is CVE-2025-55315?
Low severity, with a CVSS score of 3.1, published 14 October 2025.
Which products and versions are affected?
Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107; and 9 more.
Is there a fix for CVE-2025-55315?
Yes. Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later; Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): upgrade to 2.3.6 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-55315?
Check whether you run Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet), Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet), Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.osx-arm64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-arm (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet): upgrade to 10.0.0-rc.2.25502.107 or later
    dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.Server.Kestrel.Core (NuGet): upgrade to 2.3.6 or later
    dotnet add package Microsoft.AspNetCore.Server.Kestrel.Core --version 2.3.6

Affected products

  • Microsoft.AspNetCore.App.Runtime.linux-arm (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-musl-x64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.linux-x64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.osx-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.osx-x64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-arm (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-arm64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-x64 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.App.Runtime.win-x86 (NuGet) ECOSYSTEM:introduced=10.0.0-rc.1.25451.107,fixed=10.0.0-rc.2.25502.107
  • Microsoft.AspNetCore.Server.Kestrel.Core (NuGet) ECOSYSTEM:introduced=0,fixed=2.3.6

Identifiers

  • CVE-2025-55315
  • GHSA-5rrx-jjjq-q2r5

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