GHSA-242j-2gm6-5rwx BIT-aspnet-core-2021-1723 CVE-2021-1723
ASP.NET Core and Visual Studio Denial of Service Vulnerability
High
NuGet
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 5.30%
- Chance of exploitation in the next 30 days. Higher than 92.58% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- —
- Not classified
- Fix
- Available
- 12 packages have a fixed version
Description
A denial-of-service vulnerability exists in the way Kestrel parses HTTP/2 requests. The security update addresses the vulnerability by fixing the way the Kestrel parses HTTP/2 requests. Users are advised to upgrade.
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.AspNetCore.App.Runtime.linux-arm NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm --version 3.1.11
Microsoft.AspNetCore.App.Runtime.linux-arm64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-arm64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.linux-musl-arm NuGet → 5.0.2
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm --version 5.0.2
Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.linux-musl-x64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-musl-x64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.linux-x64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.linux-x64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.osx-x64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.osx-x64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.win-arm NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm --version 3.1.11
Microsoft.AspNetCore.App.Runtime.win-arm64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.win-arm64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.win-x64 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.win-x64 --version 3.1.11
Microsoft.AspNetCore.App.Runtime.win-x86 NuGet → 3.1.11
- dotnet
dotnet add package Microsoft.AspNetCore.App.Runtime.win-x86 --version 3.1.11
Microsoft.AspNetCore.Server.Kestrel.Core NuGet → 2.1.25
- dotnet
dotnet add package Microsoft.AspNetCore.Server.Kestrel.Core --version 2.1.25
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- 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 |
|---|---|---|
| GHSA-vmch-3w2x-vhgq .NET Denial of Service Vulnerability | High Known exploited | Also affects Microsoft.AspNetCore.App.Runtime.win-arm64 |
| GHSA-f4g7-52wc-p8x7 Microsoft Security Advisory CVE-2026-96236 - ASP.NET Core Denial of Service Vulnerability | High | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-rv87-ccxw-8ggf Microsoft Security Advisory CVE-2026-88092 - ASP.NET Core Security Feature Bypass Vulnerability | Critical | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-57xr-hfxx-jw5x Microsoft Security Advisory CVE-2026-70196 - ASP.NET Core Denial of Service Vulnerability | Medium | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-fpq8-4vhr-rcxx Microsoft Security Advisory CVE-2026-70188 - ASP.NET Core Security Feature Bypass Vulnerability | Critical | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-mf4x-w4gh-4656 Microsoft Security Advisory CVE-2026-70186 - ASP.NET Core Denial of Service Vulnerability | High | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-494h-xx7x-5frh Microsoft Security Advisory CVE-2026-70183 - ASP.NET Core Security Feature Bypass Vulnerability | High | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
| GHSA-w5qq-qrpp-rf4c Microsoft Security Advisory CVE-2026-70181 - ASP.NET Core Denial of Service Vulnerability | High | Also affects Microsoft.AspNetCore.App.Runtime.linux-arm |
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