This indicates an attack attempt to exploit a Remote Code Execution Vulnerability in Microsoft Windows Server.
A remote, unauthenticated attacker can exploit this vulnerability in a Windows DHCP Server configured in the failover mode by sending crafted requests to the target server. Successful exploitation will result in the attacker being able to execute arbitrary code with Administrative privileges, while an unsuccessful attempt will cause the DHCP server process to abnormally terminate.
Microsoft Windows Server 2012
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2016
Microsoft Windows Server 2019
Microsoft Windows Server version 1803 (Server Core Installation)
Microsoft Windows Server version 1903 (Server Core installation)
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.