This indicates an attack attempt to exploit a Buffer Overflow vulnerability in NUUO's NVRMini2.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a crafted HTTP request. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted HTTP request.
NUUO's NVRMini2 3.8.0 and below
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: