Unspecified 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 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors.
http://www.us-cert.gov/cas/techalerts/TA10-012A.html
http://www.oracle.com/technetwork/topics/security/cpujan2010-084891.html