This indicates an attack attempt against a Security Bypass vulnerability in The MySQL component in Plixer Scrutinizer aka Dell SonicWALL Scrutinizer.
The vulnerability is due to the application setting a default password of admin for the "scrutinizer" and "scrutremote" accounts. A remote attacker may be able to exploit this to send a crafted query to execute SQL commands on a vulnerable server.
Plixer Scrutinizer 188.8.131.5299 and earlier
Security Bypass: Remote attackers can bypass security checking of vulnerable systems.
Upgrade to later versions.