GHSA-3gp9-h8hw-pxpw BIT-dotnet-2021-1721 BIT-dotnet-sdk-2021-1721 CVE-2021-1721
Denial of service in .NET core
Medium
NuGet
- Severity
- 6.5 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 3.34%
- Chance of exploitation in the next 30 days. Higher than 88.66% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- —
- Not classified
- Fix
- Available
- 45 packages have a fixed version
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 versions
NuGet
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
Microsoft.NETCore.App NuGet → 2.1.25
- dotnet
dotnet add package Microsoft.NETCore.App --version 2.1.25
Microsoft.NETCore.App.Host.linux-arm NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.linux-arm --version 3.1.12
Microsoft.NETCore.App.Host.linux-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.linux-arm64 --version 3.1.12
Microsoft.NETCore.App.Host.linux-musl-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.linux-musl-arm64 --version 3.1.12
Microsoft.NETCore.App.Host.linux-musl-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.linux-musl-x64 --version 3.1.12
Microsoft.NETCore.App.Host.linux-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.linux-x64 --version 3.1.12
Microsoft.NETCore.App.Host.osx-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.osx-x64 --version 3.1.12
Microsoft.NETCore.App.Host.rhel.6-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.rhel.6-x64 --version 3.1.12
Microsoft.NETCore.App.Host.win-arm NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.win-arm --version 3.1.12
Microsoft.NETCore.App.Host.win-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.win-arm64 --version 3.1.12
Microsoft.NETCore.App.Host.win-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.win-x64 --version 3.1.12
Microsoft.NETCore.App.Host.win-x86 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Host.win-x86 --version 3.1.12
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.linux-arm NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-arm --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.linux-arm64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-arm64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.linux-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.linux-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.Mono.osx-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.Mono.osx-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.android-arm NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.android-arm --version 5.0.3
Microsoft.NETCore.App.Runtime.android-arm64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.android-arm64 --version 5.0.3
Microsoft.NETCore.App.Runtime.android-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.android-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.android-x86 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.android-x86 --version 5.0.3
Microsoft.NETCore.App.Runtime.browser-wasm NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.browser-wasm --version 5.0.3
Microsoft.NETCore.App.Runtime.ios-arm NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.ios-arm --version 5.0.3
Microsoft.NETCore.App.Runtime.ios-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.ios-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.ios-x86 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.ios-x86 --version 5.0.3
Microsoft.NETCore.App.Runtime.linux-arm NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm --version 3.1.12
Microsoft.NETCore.App.Runtime.linux-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-arm64 --version 3.1.12
Microsoft.NETCore.App.Runtime.linux-musl-arm NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm --version 5.0.3
Microsoft.NETCore.App.Runtime.linux-musl-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-arm64 --version 3.1.12
Microsoft.NETCore.App.Runtime.linux-musl-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-musl-x64 --version 3.1.12
Microsoft.NETCore.App.Runtime.linux-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.linux-x64 --version 3.1.12
Microsoft.NETCore.App.Runtime.osx-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.osx-x64 --version 3.1.12
Microsoft.NETCore.App.Runtime.rhel.6-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.rhel.6-x64 --version 3.1.12
Microsoft.NETCore.App.Runtime.tvos-arm64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.tvos-arm64 --version 5.0.3
Microsoft.NETCore.App.Runtime.tvos-x64 NuGet → 5.0.3
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.tvos-x64 --version 5.0.3
Microsoft.NETCore.App.Runtime.win-arm NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.win-arm --version 3.1.12
Microsoft.NETCore.App.Runtime.win-arm64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.win-arm64 --version 3.1.12
Microsoft.NETCore.App.Runtime.win-x64 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.win-x64 --version 3.1.12
Microsoft.NETCore.App.Runtime.win-x86 NuGet → 3.1.12
- dotnet
dotnet add package Microsoft.NETCore.App.Runtime.win-x86 --version 3.1.12
Severity breakdown
CVSS 3.1 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
References
Advisories
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| CVE-2020-1147 .NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability | High Known exploited | Also affects Microsoft.NETCore.App |
| GHSA-87vj-4hqv-22p9 Microsoft Security Advisory CVE-2026-96233 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-2j93-m82w-73j2 Microsoft Security Advisory CVE-2026-96231 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-w6wh-p4g7-mpj2 Microsoft Security Advisory CVE-2026-96225 - .NET and Visual Studio Elevation of Privilege Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-4mpw-cpwj-hxxj Microsoft Security Advisory CVE-2026-70197 - .NET and Visual Studio Remote Code Execution Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.win-x64 |
| GHSA-fqpq-cx42-9jmm Microsoft Security Advisory CVE-2026-70194 - .NET and Visual Studio Security Feature Bypass Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-3rxq-g8rj-r2cf Microsoft Security Advisory CVE-2026-69651 - .NET and Visual Studio Denial of Service Vulnerability | High | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
| GHSA-wxxw-5cvc-53j7 Microsoft Security Advisory CVE-2026-66822 - .NET and Visual Studio Information Disclosure Vulnerability | Medium | Also affects Microsoft.NETCore.App.Runtime.linux-arm |
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