CVE-2023-38180
HIGHCVE-2023-38180 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in Microsoft.AspNetCore.App.Runtime.win-arm64. It is in CISA's Known Exploited Vulnerabilities catalog (added 2023-08-09) — treat it as actively exploited and patch now. O3 Security confirms whether CVE-2023-38180 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
.NET Denial of Service Vulnerability
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2023-08-09. Federal agencies were required to remediate by 2023-08-30.
- 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 (KEV catalog and SSVC triage) for CVE-2023-38180.
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-2023-38180 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 0 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
Microsoft.AspNetCore.App.Runtime.win-arm64.NETMicrosoft.AspNetCore.App.Runtime.win-x64.NETMicrosoft.AspNetCore.App.Runtime.win-x86.NETMicrosoft.AspNetCore.Server.Kestrel.Transport.Libuv.NETMicrosoft.AspNetCore.App.Runtime.win-arm64.NETMicrosoft.AspNetCore.App.Runtime.win-x64.NETMicrosoft.AspNetCore.App.Runtime.win-x86.NETMicrosoft.AspNetCore.Server.Kestrel.Transport.Libuv+1 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.AspNetCore.App.Runtime.win-arm64 | ≥ 7.0.0&&< 7.0.10 | 7.0.10 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | ≥ 7.0.0&&< 7.0.10 | 7.0.10 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-x86 | ≥ 7.0.0&&< 7.0.10 | 7.0.10 |
| .NETNuGet | Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv | ≥ 6.0.0&&< 6.0.21 | 6.0.21 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-arm64 | ≥ 6.0.0&&< 6.0.21 | 6.0.21 |
| .NETNuGet | Microsoft.AspNetCore.App.Runtime.win-x64 | ≥ 6.0.0&&< 6.0.21 | 6.0.21 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Microsoft.AspNetCore.App.Runtime.win-arm64. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update Microsoft.AspNetCore.App.Runtime.win-arm64 to 7.0.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-38180 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 pinpoints whether CVE-2023-38180 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2023-38180. 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.
Frequently Asked Questions
Is CVE-2023-38180 in your dependencies?
O3 detects CVE-2023-38180 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.