Cisco ONS15454 and ONS15327 running ONS before 3.4 allows attackers to cause a denial of service (reset) via an HTTP request to the TCC, TCC+ or XTC, in which the request contains an invalid CORBA Interoperable Object Reference (IOR).
http://www.securityfocus.com/bid/6084
http://www.iss.net/security_center/static/10508.php
http://www.cisco.com/warp/public/707/ons-multiple-vuln-pub.shtml