.NET Core is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation. A new version of .NET Core that addresses a security vulnerability is now available. The updated version is .NET Core Runtime 2.1.20 and SDK 2.1.516. Security Fix: * .NT Core: XML source markup processing remote code execution Default inclusions for applications built with .NET Core have been updated to reference the newest versions and their security fixes. For more details about the security issue, including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.