.NET Core June 2020 Updates – 2.1.19 and 3.1.5

Rahul Bhandari (MSFT)

Today, we are releasing the .NET Core June 2020 Update. These updates contain security and reliability fixes. See the individual release notes for details on updated packages.


CVE-2020-1108: .NET Core Denial of Service Vulnerability

To comprehensively address CVE-2020-1108, Microsoft has released updates for .NET Core 2.1 and .NET Core 3.1. Customers who use any of these versions of .NET Core should install the latest version of .NET Core. See the Release Notes for the latest version numbers and instructions for updating .NET Core.

Microsoft is aware of a denial of service vulnerability which exists when .NET Core improperly handles web requests. An attacker who successfully exploited this vulnerability could cause a denial of service against a .NET Core web application. The vulnerability can be exploited remotely, without authentication. 

A remote unauthenticated attacker could exploit this vulnerability by issuing specially crafted requests to the .NET Core application. The update addresses the vulnerability by correcting how the .NET Core web application handles web requests. 

Getting the Update

See the .NET Core release notes for details on the release, including issues fixed and affected packages. 

The latest .NET Core updates are available on the .NET Core download page.

Docker Images

.NET Docker images have been updated for today’s release. The following repos have been updated.

Note: You must pull updated .NET Core container images to get this update, with either docker pull or docker build --pull.

Visual Studio 

This update will be included in a future update of Visual Studio. 

Each version of Visual studio is only supported with a given version of the .NET Core SDK. Visual Studio version information is included in the .NET Core SDK download pages and release notes. If you are not using Visual Studio, we recommend using the latest SDK release.