High severity7.5NVD Advisory· Published Aug 12, 2021· Updated Aug 10, 2026
CVE-2021-26423
CVE-2021-26423
Description
.NET Core and Visual Studio Denial of Service Vulnerability
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
Microsoft.NETCore.App.Runtime.win-x86NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.win-x86NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.win-x64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.win-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.win-arm64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.win-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.win-armNuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.win-armNuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.osx-x64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.osx-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.osx-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.linux-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.linux-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.Mono.linux-armNuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.linux-x64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.linux-musl-x64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-musl-x64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.linux-musl-arm64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-musl-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.linux-musl-armNuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.rhel.6-x64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-arm64NuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-arm64NuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Microsoft.NETCore.App.Runtime.linux-armNuGet | >= 3.1.0, < 3.1.18 | 3.1.18 |
Microsoft.NETCore.App.Runtime.linux-armNuGet | >= 5.0.0, < 5.0.9 | 5.0.9 |
Affected products
31- cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*Range: >=15.0,<=15.9
cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*range: >=16.0,<=16.10
- cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*
- osv-coords25 versionspkg:bitnami/dotnetpkg:bitnami/dotnet-sdkpkg:nuget/microsoft.netcore.app.runtime.linux-armpkg:nuget/microsoft.netcore.app.runtime.linux-arm64pkg:nuget/microsoft.netcore.app.runtime.linux-musl-armpkg:nuget/microsoft.netcore.app.runtime.linux-musl-arm64pkg:nuget/microsoft.netcore.app.runtime.linux-musl-x64pkg:nuget/microsoft.netcore.app.runtime.linux-x64pkg:nuget/microsoft.netcore.app.runtime.mono.linux-armpkg:nuget/microsoft.netcore.app.runtime.mono.linux-arm64pkg:nuget/microsoft.netcore.app.runtime.mono.linux-musl-x64pkg:nuget/microsoft.netcore.app.runtime.mono.linux-x64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.aot.linux-arm64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.aot.linux-x64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.aot.osx-x64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.linux-arm64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.linux-x64pkg:nuget/microsoft.netcore.app.runtime.mono.llvm.osx-x64pkg:nuget/microsoft.netcore.app.runtime.mono.osx-x64pkg:nuget/microsoft.netcore.app.runtime.osx-x64pkg:nuget/microsoft.netcore.app.runtime.rhel.6-x64pkg:nuget/microsoft.netcore.app.runtime.win-armpkg:nuget/microsoft.netcore.app.runtime.win-arm64pkg:nuget/microsoft.netcore.app.runtime.win-x64pkg:nuget/microsoft.netcore.app.runtime.win-x86
>= 5.0.0, < 5.0.9+ 24 more
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 5.0.0, < 5.0.9
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
- (no CPE)range: >= 3.1.0, < 3.1.18
Patches
Vulnerability mechanics
References
6- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-rh58-r7jh-xhx3ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-26423ghsaADVISORY
- github.com/dotnet/announcements/issues/194ghsaWEB
- github.com/dotnet/runtime/security/advisories/GHSA-rh58-r7jh-xhx3ghsaWEB
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26423nvd
News mentions
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