This indicates an attack attempt to exploit an Unauthenticated Remote Code Execution Vulnerability in SolarWinds DameWare Mini Remote Control.
A remote, unauthenticated attacker could exploit this vulnerability by sending a specially crafted message to the target system on port 6129. Successful exploitation allows the attack to upload arbitrary files and achieve remote code execution on the vulnerable system.
SolarWinds DameWare Mini Remote Control prior to 12.0.x Hot Fix 1 or 12.1 Hot Fix 3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.