NGSSoftware Insight Security Research Advisory – The Oracle RDBMS on receiving an invalid TNS data packet will use 100% of the CPU’s time introducing a denial of service condition.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/60191/NISR17102007D.txt
Source: https://packetstormsecurity.com/files/60191/NISR17102007D.txt.html