This indicates an attack attempt to exploit an Elevation of Privilege vulnerability in Schneider Electric NET55XX Encoder.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted HTTP requst. A remote attacker may be able to exploit this to escalate their privileges on vulnerable systems.
Schneider Electric series NET55XX Encoder with firmware pior to version 220.127.116.11
Privilege Escalation: Remote attackers can leverage their privileges on vulnerable systems.
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.