This indicates an attack attempt to exploit a Buffer Overflow Vulnerability in TurboVNC TurboVNC.
A remote attacker could exploit this vulnerability by sending malicious packets to the server. Successful exploitation could result in arbitrary code execution under the security context of the Xvnc service.
TurboVNC TurboVNC prior to 2.2.3
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.