A remote code execution issue exists in Windows Domain Name System servers when they fail to properly handle requests. This can be exploited by a remote attacker using a specially crafted DNS request, allowing them to execute arbitrary code. The vulnerability is also known as 'Windows DNS Server Remote Code Execution Vulnerability' and has been present for 17 years, affecting Windows DNS Servers from 2013 to 2019 editions. It is a 'wormable' bug, enabling attackers to launch malware attacks that can spread from one vulnerable computer to another without human interaction.