This indicates an attack attempt to exploit an Information Disclosure vulnerability in Sierra Wireless AirLink ES450.
The vulnerability is due to insufficient validation of user supplied inputs. A remote attacker can exploit this to gain access to sensitive information and modify system settings.
Sierra Wireless AirLink ES450 FW 4.9.3
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Apply the most recent upgrade or patch from the vendor.