This indicates an attack attempt against a code execution vulnerability in Oracle Database.
The vulnerability is caused by an error when the vulnerable software handles a malicious TNS packet. It allows a remote attacker to execute arbitrary code via sending crafted request.
Oracle Database 220.127.116.11, 18.104.22.168DV, 10.1.0.5, 10.2.0.4, and 22.214.171.124
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply patch, available from the web site: