This indicates an attack attempt against a Security Bypass Vulnerability in Oracle Java Runtime Environment.
The vulnerability is due to improper checks and handling of certain Java methods. An attacker can exploit this by tricking an unsuspecting user into visiting a webpage containing a malicious Java applet and execute Java code within the security context of the user.
Oracle JDK and JRE 7
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch provided by vendor to address this issue in the following website: