GHSA-3gp9-h8hw-pxpw — Microsoft.NETCore.App
MEDIUMGHSA-3gp9-h8hw-pxpw is a medium-severity (CVSS 6.5) vulnerability in Microsoft.NETCore.App. A fix is available for Microsoft.NETCore.App — see the affected versions and patch details below.
Denial of service in .NET core
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-3gp9-h8hw-pxpw.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
GHSA-3gp9-h8hw-pxpw plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 377,636 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
Microsoft.NETCore.App.NETMicrosoft.NETCore.App.Host.linux-arm.NETMicrosoft.NETCore.App.Host.linux-arm64.NETMicrosoft.NETCore.App.Host.linux-musl-arm64.NETMicrosoft.NETCore.App.Host.linux-musl-x64.NETMicrosoft.NETCore.App.Host.linux-x64.NETMicrosoft.NETCore.App.Host.osx-x64.NETMicrosoft.NETCore.App.Host.rhel.6-x64+47 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
.NET Core and Visual Studio Denial of Service Vulnerability due to a vulnerability which exists when creating HTTPS web request during X509 certificate chain building.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Microsoft.NETCore.App | ≥ 2.1.0&&< 2.1.25 | 2.1.25dotnet add package Microsoft.NETCore.App --version 2.1.25 |
| .NETNuGet | Microsoft.NETCore.App.Host.linux-arm | ≥ 3.1.0&&< 3.1.12 | 3.1.12dotnet add package Microsoft.NETCore.App.Host.linux-arm --version 3.1.12 |
| .NETNuGet | Microsoft.NETCore.App.Host.linux-arm64 | ≥ 3.1.0&&< 3.1.12 | 3.1.12dotnet add package Microsoft.NETCore.App.Host.linux-arm64 --version 3.1.12 |
| .NETNuGet | Microsoft.NETCore.App.Host.linux-musl-arm64 | ≥ 3.1.0&&< 3.1.12 | 3.1.12dotnet add package Microsoft.NETCore.App.Host.linux-musl-arm64 --version 3.1.12 |
| .NETNuGet | Microsoft.NETCore.App.Host.linux-musl-x64 | ≥ 3.1.0&&< 3.1.12 | 3.1.12dotnet add package Microsoft.NETCore.App.Host.linux-musl-x64 --version 3.1.12 |
| .NETNuGet | Microsoft.NETCore.App.Host.linux-x64 | ≥ 3.1.0&&< 3.1.12 | 3.1.12dotnet add package Microsoft.NETCore.App.Host.linux-x64 --version 3.1.12 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.NETCore.App, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Microsoft.NETCore.App to 2.1.25 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-3gp9-h8hw-pxpw is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-3gp9-h8hw-pxpw can be triaged on real exposure rather than presence alone.
Tailored to GHSA-3gp9-h8hw-pxpw. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| .NET Core on Red Hat Enterprise Linux | rh-dotnet21-0:2.1-24.el7_9 | RHSA-2021:0470 |
| .NET Core on Red Hat Enterprise Linux | rh-dotnet31-dotnet-0:3.1.112-1.el7_9 | RHSA-2021:0472 |
| .NET Core on Red Hat Enterprise Linux | rh-dotnet50-dotnet-0:5.0.103-1.el7_9 | RHSA-2021:0473 |
| Red Hat Enterprise Linux 8 | dotnet3.1-0:3.1.112-1.el8_3 | RHSA-2021:0471 |
| Red Hat Enterprise Linux 8 | dotnet-0:2.1.521-1.el8_3 | RHSA-2021:0474 |
| Red Hat Enterprise Linux 8 | dotnet5.0-0:5.0.103-1.el8_3 | RHSA-2021:0476 |
Frequently Asked Questions
Is GHSA-3gp9-h8hw-pxpw in your dependencies?
O3 Security finds GHSA-3gp9-h8hw-pxpw across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.