The forms servlet (f90servlet) in Oracle Forms 4.5.10.22 allows remote attackers to cause a denial of service (TNS listener stop) via a userid parameter that contains a STOP command.
https://exchange.xforce.ibmcloud.com/vulnerabilities/22543
http://www.oracle.com/technology/deploy/security/pdf/cpujul2005.html
http://securityreason.com/securityalert/65