CVE-2021-1721

.NET Core and Visual Studio Denial of Service Vulnerability

6.5 MediumFix available

.NET Core and Visual Studio Denial of Service Vulnerability

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

3.34%Down 2.3 points since Apr 14, 2021

What each source reports

CVE List Score used 6.5

.NET Core and Visual Studio Denial of Service Vulnerability

.NET Core and Visual Studio Denial of Service Vulnerability

Record: CVE-2021-1721
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
Updated: 2026-11-02

EUVDEUVD-2022-2181 6.5

.NET Core and Visual Studio Denial of Service Vulnerability

Record: EUVD-2022-2181
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
Updated: 2026-11-02

GitHub AdvisoriesGHSA-3gp9-h8hw-pxpw 6.5

Denial of service in .NET core

.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.

Record: GHSA-3gp9-h8hw-pxpw
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

NVD 6.5

.NET Core and Visual Studio Denial of Service Vulnerability

Record: CVE-2021-1721
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Updated: 2026-11-02

OSV 6.5

.NET Core and Visual Studio Denial of Service Vulnerability

Record: CVE-2021-1721
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-3gp9-h8hw-pxpw 6.5

Denial of service in .NET core

.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.

Record: GHSA-3gp9-h8hw-pxpw
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Show 8 moreShow less

OSVRHSA-2021:0470 6.5

Red Hat Security Advisory: .NET Core 2.1 on Red Hat Enterprise Linux security and bugfix update

Record: RHSA-2021:0470
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2021:0471 6.5

Red Hat Security Advisory: dotnet3.1 security and bugfix update

Record: RHSA-2021:0471
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2021:0472 6.5

Red Hat Security Advisory: .NET Core 3.1 on Red Hat Enterprise Linux security and bugfix update

Record: RHSA-2021:0472
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2021:0473 6.5

Red Hat Security Advisory: .NET 5.0 on Red Hat Enterprise Linux security and bugfix update

Record: RHSA-2021:0473
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2021:0474 6.5

Red Hat Security Advisory: dotnet security and bugfix update

Record: RHSA-2021:0474
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2021:0476 6.5

Red Hat Security Advisory: dotnet5.0 security and bugfix update

Record: RHSA-2021:0476
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVBIT-dotnet-2021-1721 No score

.NET Core and Visual Studio Denial of Service Vulnerability

.NET Core and Visual Studio Denial of Service Vulnerability

Record: BIT-dotnet-2021-1721
Updated: 2026-11-02

OSVBIT-dotnet-sdk-2021-1721 No score

.NET Core and Visual Studio Denial of Service Vulnerability

.NET Core and Visual Studio Denial of Service Vulnerability

Record: BIT-dotnet-sdk-2021-1721
Updated: 2026-11-02

Affected products

Show 2 moreShow less

Affected packages

Affected packages
Package	Affected	Fixed
`Microsoft.NETCore.App` NuGet	2.1.0 up to 2.1.25	2.1.25
`Microsoft.NETCore.App.Host.linux-arm` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.linux-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.linux-musl-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.linux-musl-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.linux-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.osx-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.rhel.6-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.win-arm` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.win-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12

Show 178 moreShow less

Affected packages
Package	Affected	Fixed
`Microsoft.NETCore.App.Host.win-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Host.win-x86` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.linux-arm` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.linux-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.linux-musl-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.linux-musl-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.linux-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.osx-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.rhel.6-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.win-arm` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.win-arm64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.win-x64` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.win-x86` NuGet	3.1.0 up to 3.1.12	3.1.12
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.osx-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.android-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.android-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.android-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.android-x86` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.browser-wasm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.ios-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.ios-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.ios-x86` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.linux-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.osx-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.tvos-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.tvos-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.win-arm` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.win-arm64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.win-x64` NuGet	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App.Runtime.win-x86` NuGet	5.0.0 up to 5.0.3	5.0.3
`dotnet` Bitnami	5.0.0 up to 5.0.3	5.0.3
`dotnet-sdk` Bitnami	5.0.0 up to 5.0.3	5.0.3
`Microsoft.NETCore.App` NuGet	2.1.0 up to 2.1.25, plus listed versions 2.1.12.1.102.1.112.1.122.1.13 Show 19 moreShow less 2.1.142.1.152.1.162.1.172.1.182.1.192.1.22.1.202.1.212.1.222.1.232.1.242.1.32.1.42.1.52.1.62.1.72.1.82.1.9	2.1.25
`Microsoft.NETCore.App.Host.linux-arm` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.linux-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.linux-musl-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.linux-musl-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.linux-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.osx-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.rhel.6-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.win-arm` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.win-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.win-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Host.win-x86` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.linux-arm` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.linux-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.linux-musl-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.linux-musl-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.linux-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.osx-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.rhel.6-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.win-arm` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.win-arm64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.win-x64` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.win-x86` NuGet	3.1.0 up to 3.1.12, plus listed versions 3.1.13.1.103.1.113.1.23.1.3 Show 6 moreShow less 3.1.43.1.53.1.63.1.73.1.83.1.9	3.1.12
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.linux-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.AOT.osx-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.linux-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.LLVM.osx-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-musl-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.linux-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.Mono.osx-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.android-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.android-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.android-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.android-x86` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.browser-wasm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.ios-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.ios-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.ios-x86` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-musl-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.linux-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.osx-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.tvos-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.tvos-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.win-arm` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.win-arm64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.win-x64` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`Microsoft.NETCore.App.Runtime.win-x86` NuGet	5.0.0 up to 5.0.3, plus listed versions 5.0.15.0.2	5.0.3
`rh-dotnet21` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1-24.el7_9	0:2.1-24.el7_9
`rh-dotnet21-dotnet` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.521-1.el7_9	0:2.1.521-1.el7_9
`rh-dotnet21-dotnet-debuginfo` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.521-1.el7_9	0:2.1.521-1.el7_9
`rh-dotnet21-dotnet-host` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.25-1.el7_9	0:2.1.25-1.el7_9
`rh-dotnet21-dotnet-runtime-2.1` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.25-1.el7_9	0:2.1.25-1.el7_9
`rh-dotnet21-dotnet-sdk-2.1` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.521-1.el7_9	0:2.1.521-1.el7_9
`rh-dotnet21-dotnet-sdk-2.1.5xx` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1.521-1.el7_9	0:2.1.521-1.el7_9
`rh-dotnet21-runtime` Red Hat:rhel_dotnet:2.1::el7	before 0:2.1-24.el7_9	0:2.1-24.el7_9
`aspnetcore-runtime-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`aspnetcore-targeting-pack-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-apphost-pack-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-apphost-pack-3.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-hostfxr-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-hostfxr-3.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-runtime-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-runtime-3.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-sdk-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`dotnet-sdk-3.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`dotnet-targeting-pack-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.12-1.el8_3	0:3.1.12-1.el8_3
`dotnet-templates-3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`dotnet3.1` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`dotnet3.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`dotnet3.1-debugsource` Red Hat:enterprise_linux:8::appstream	before 0:3.1.112-1.el8_3	0:3.1.112-1.el8_3
`rh-dotnet31-aspnetcore-runtime-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-aspnetcore-targeting-pack-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.112-1.el7_9	0:3.1.112-1.el7_9
`rh-dotnet31-dotnet-apphost-pack-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet-debuginfo` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.112-1.el7_9	0:3.1.112-1.el7_9
`rh-dotnet31-dotnet-host` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet-hostfxr-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet-runtime-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet-sdk-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.112-1.el7_9	0:3.1.112-1.el7_9
`rh-dotnet31-dotnet-targeting-pack-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.12-1.el7_9	0:3.1.12-1.el7_9
`rh-dotnet31-dotnet-templates-3.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.112-1.el7_9	0:3.1.112-1.el7_9
`rh-dotnet31-netstandard-targeting-pack-2.1` Red Hat:rhel_dotnet:3.1::el7	before 0:3.1.112-1.el7_9	0:3.1.112-1.el7_9
`rh-dotnet50-aspnetcore-runtime-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-aspnetcore-targeting-pack-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.103-1.el7_9	0:5.0.103-1.el7_9
`rh-dotnet50-dotnet-apphost-pack-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet-debuginfo` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.103-1.el7_9	0:5.0.103-1.el7_9
`rh-dotnet50-dotnet-host` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet-hostfxr-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet-runtime-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet-sdk-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.103-1.el7_9	0:5.0.103-1.el7_9
`rh-dotnet50-dotnet-targeting-pack-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.3-1.el7_9	0:5.0.3-1.el7_9
`rh-dotnet50-dotnet-templates-5.0` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.103-1.el7_9	0:5.0.103-1.el7_9
`rh-dotnet50-netstandard-targeting-pack-2.1` Red Hat:rhel_dotnet:5.0::el7	before 0:5.0.103-1.el7_9	0:5.0.103-1.el7_9
`dotnet` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`dotnet-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`dotnet-debugsource` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`dotnet-host-fxr-2.1` Red Hat:enterprise_linux:8::appstream	before 0:2.1.25-1.el8_3	0:2.1.25-1.el8_3
`dotnet-host-fxr-2.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:2.1.25-1.el8_3	0:2.1.25-1.el8_3
`dotnet-runtime-2.1` Red Hat:enterprise_linux:8::appstream	before 0:2.1.25-1.el8_3	0:2.1.25-1.el8_3
`dotnet-runtime-2.1-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:2.1.25-1.el8_3	0:2.1.25-1.el8_3
`dotnet-sdk-2.1` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`dotnet-sdk-2.1.5xx` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`dotnet-sdk-2.1.5xx-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:2.1.521-1.el8_3	0:2.1.521-1.el8_3
`aspnetcore-runtime-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`aspnetcore-targeting-pack-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet-apphost-pack-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-apphost-pack-5.0-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-host` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-host-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-hostfxr-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-hostfxr-5.0-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-runtime-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-runtime-5.0-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-sdk-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet-sdk-5.0-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet-targeting-pack-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.3-1.el8_3	0:5.0.3-1.el8_3
`dotnet-templates-5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet5.0` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet5.0-debuginfo` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`dotnet5.0-debugsource` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3
`netstandard-targeting-pack-2.1` Red Hat:enterprise_linux:8::appstream	before 0:5.0.103-1.el8_3	0:5.0.103-1.el8_3

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-1721 is a medium vulnerability (CVSS 6.5) in Microsoft .net, published February 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.34%, the 88th percentile. Fixed in Microsoft.NETCore.App 2.1.25.

References

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