This advisory and proof of concept exploit demonstrates a denial of service vulnerability in the Listener component in Oracle Database 9.2.0.8, 9.2.0.8DV, 10.1.0.5, 10.2.0.4, and 11.1.0.7.
86678bea8c72fe75e57484da3a12c8ee6da6492b81d602bc341865f30a146aa9