This indicates an attack attempt to exploit a buffer-overflow vulnerability in the Sun Java Runtime Environment's isInstalled.dnsResolve() function.
The vulnerability is caused by an error when the vulnerable function handles overly long strings. It could allow a remote attacker to execute arbitrary code.
Sun JRE 1.6.0_10
Sun JRE 1.6.0_0
Sun Java Web Start 0
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently, we are not aware of any vendor supplied patch for this issue