CVE-2024-21392 — Microsoft.NETCore.App.Run…
HIGHCVE-2024-21392 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in Microsoft.NETCore.App.Runtime.linux-arm. A fix is available for Microsoft.NETCore.App.Runtime.linux-arm — see the affected versions and patch details below.
Microsoft Security Advisory CVE-2024-21392: .NET Denial of Service Vulnerability
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for CVE-2024-21392.
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
CVE-2024-21392 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 377,333 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.Runtime.linux-arm.NETMicrosoft.NETCore.App.Runtime.linux-arm.NETMicrosoft.NETCore.App.Runtime.linux-arm64.NETMicrosoft.NETCore.App.Runtime.linux-arm64.NETMicrosoft.NETCore.App.Runtime.linux-musl-arm.NETMicrosoft.NETCore.App.Runtime.linux-musl-arm.NETMicrosoft.NETCore.App.Runtime.linux-musl-arm64.NETMicrosoft.NETCore.App.Runtime.linux-musl-arm64+16 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 and Visual Studio Denial of Service Vulnerability
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm | ≥ 7.0.0-preview.1.22076.8&&< 7.0.17 | 7.0.17dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 7.0.17 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm | ≥ 8.0.0&&< 8.0.3 | 8.0.3dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 8.0.3 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm64 | ≥ 7.0.0-preview.1.22076.8&&< 7.0.17 | 7.0.17dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 7.0.17 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-arm64 | ≥ 8.0.0&&< 8.0.3 | 8.0.3dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 8.0.3 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-musl-arm | ≥ 7.0.0-preview.1.22076.8&&< 7.0.17 | 7.0.17dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 7.0.17 |
| .NETNuGet | Microsoft.NETCore.App.Runtime.linux-musl-arm | ≥ 8.0.0&&< 8.0.3 | 8.0.3dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 8.0.3 |
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.Runtime.linux-arm, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Microsoft.NETCore.App.Runtime.linux-arm to 7.0.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2024-21392 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 CVE-2024-21392 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2024-21392. 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.
The versions of dotnet6.0, as shipped within Red Hat-supported products, are not affected by this issue.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 8 | dotnet7.0-0:7.0.117-1.el8_9 | RHSA-2024:1308 |
| Red Hat Enterprise Linux 8 | dotnet8.0-0:8.0.103-1.el8_9 | RHSA-2024:1311 |
| Red Hat Enterprise Linux 9 | dotnet7.0-0:7.0.117-1.el9_3 | RHSA-2024:1309 |
| Red Hat Enterprise Linux 9 | dotnet8.0-0:8.0.103-2.el9_3 | RHSA-2024:1310 |
Frequently Asked Questions
Is CVE-2024-21392 in your dependencies?
O3 Security finds CVE-2024-21392 across NuGet dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.