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Advisory record · GHSA-5rrx-jjjq-q2r5

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

CVSS 9.9 CriticalCriticalEPSS 0.67 · 99th percentile

Critical, because:

  • CVSS score 9.9: 9.0 or more.
  • CVSS score 9.9 (7.0 or more) and EPSS 0.67 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 14 Oct 2025, 20:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
Microsoft.AspNetCore.Server.Kestrel.CoreNuGet<2.3.62.3.6
Microsoft.AspNetCore.App.Runtime.linux-armNuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.linux-arm64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.linux-musl-armNuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.linux-musl-x64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.linux-x64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.osx-arm64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.osx-x64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.win-armNuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.win-arm64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.win-x64NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Microsoft.AspNetCore.App.Runtime.win-x86NuGet>=10.0.0-rc.1.25451.107, <10.0.0-rc.2.25502.107 || >=9.0.0, <9.0.10 || >=8.0.0, <8.0.2110.0.0-rc.2.25502.107, 9.0.10, 8.0.21
Identifiers
GHSA-5rrx-jjjq-q2r5 · BIT-aspnet-core-2025-55315 · CVE-2025-55315
Weakness (CWE)
CWE-444
Tags
Published
14 Oct 2025
Updated
10 Sept 2026

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.9 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.67, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:21 UTC First seen by agentprime
  2. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.