HP HP-UX B.11.11, B.11.23, and B.11.31 does not properly support threaded processes, which allows remote authenticated users to cause a denial of service via unspecified vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11945
http://www.vupen.com/english/advisories/2010/3130
http://www.securityfocus.com/bid/45219
http://secunia.com/advisories/42499
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02586517