GHSA-vgwq-hfqc-58wv — Microsoft.NETCore.App
MEDIUMGHSA-vgwq-hfqc-58wv is a medium-severity (CVSS 5.5) vulnerability in Microsoft.NETCore.App. A fix is available for Microsoft.NETCore.App — see the affected versions and patch details below.
.NET Core Information Disclosure Vulnerability
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-vgwq-hfqc-58wv 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 378,567 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.Runtime.linux-arm.NETMicrosoft.NETCore.App.Runtime.linux-arm64.NETMicrosoft.NETCore.App.Runtime.linux-musl-arm64.NETMicrosoft.NETCore.App.Runtime.linux-musl-x64.NETMicrosoft.NETCore.App.Runtime.linux-x64.NETMicrosoft.NETCore.App.Runtime.osx-x64.NETMicrosoft.NETCore.App.Runtime.rhel.6-x64+26 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
Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 5.0, .NET Core 3.1 and .NET Core 2.1. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
An information disclosure vulnerability exists in .NET 5.0, .NET Core 3.1 and .NET Core 2.1 when dumps created by the tool to collect crash dumps and dumps on demand are created with global read permissions on Linux and macOS.
Patches
-
If you're using .NET 5.0, you should download and install Runtime 5.0.9 or SDK 5.0.206 (for Visual Studio 2019 v16.8) or SDK 5.0.303 (for Visual Studio 2019 V16.10) from https://dotnet.microsoft.com/download/dotnet-core/5.0.
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If you're using .NET Core 3.1, you should download and install Runtime 3.1.18 or SDK 3.1.118 (for Visual Studio 2019 v16.4) or 3.1.412 (for Visual Studio 2019 v16.7 or later) from https://dotnet.microsoft.com/download/dotnet-core/3.1.
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If you're using .NET Core 2.1, you should download and install Runtime 2.1.29 or SDK 2.1.525 (for Visual Studio 2019 v15.9) or 2.1.817 from https://dotnet.microsoft.com/download/dotnet-core/2.1.
Other Details
- Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/196
- An Issue for this can be found at https://github.com/dotnet/runtime/issues/57174
- MSRC details for this can be found at https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34485
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Microsoft.NETCore.App | ≥ 2.1.0&&< 2.1.29 | 2.1.29dotnet add package Microsoft.NETCore.App --version 2.1.29 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm | ≥ 3.1.0&&< 3.1.18 | 3.1.18dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 3.1.18 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm64 | ≥ 3.1.0&&< 3.1.18 | 3.1.18dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 3.1.18 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-musl-arm64 | ≥ 3.1.0&&< 3.1.18 | 3.1.18dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 3.1.18 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-musl-x64 | ≥ 3.1.0&&< 3.1.18 | 3.1.18dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 3.1.18 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-x64 | ≥ 3.1.0&&< 3.1.18 | 3.1.18dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 3.1.18 |
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 2.1.29 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vgwq-hfqc-58wv 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-vgwq-hfqc-58wv can be triaged on real exposure rather than presence alone.
Tailored to GHSA-vgwq-hfqc-58wv. 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-dotnet21-0:2.1-28.el7_9 | RHSA-2021:3144 |
| .NET Core on Red Hat Enterprise Linux | rh-dotnet31-dotnet-0:3.1.118-1.el7_9 | RHSA-2021:3143 |
| .NET Core on Red Hat Enterprise Linux | rh-dotnet50-dotnet-0:5.0.206-1.el7_9 | RHSA-2021:3147 |
| Red Hat Enterprise Linux 8 | dotnet3.1-0:3.1.118-1.el8_4 | RHSA-2021:3142 |
| Red Hat Enterprise Linux 8 | dotnet-0:2.1.525-1.el8_4 | RHSA-2021:3145 |
| Red Hat Enterprise Linux 8 | dotnet5.0-0:5.0.206-1.el8_4 | RHSA-2021:3148 |
Frequently Asked Questions
Is GHSA-vgwq-hfqc-58wv in your dependencies?
O3 Security finds GHSA-vgwq-hfqc-58wv across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.