Oracle listener between Oracle 9i and Oracle 8.0 allows remote attackers to cause a denial of service via a malformed connection packet that contains an incorrect requester_version value that does not match an expected offset to the data.

Oracle listener process on Windows NT redirects connection requests to another port and creates a separate thread to process the request, which allows remote attackers to cause a denial of service by repeatedly connecting to the Oracle listener but not connecting to the redirected port.