This indicates an attack attempt to exploit a SQL Injection vulnerability in ATutor.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. It may allow remote attackers to execute arbitrary SQL statements via a crafted HTTP request..
ATutor 2.2.1 and prior version
System Compromise: Remote attackers can add, view, delete or modify data in the database of the affected application
Apply the latest update from the vendor.