Buffer overflow in wall for HP-UX 10.20 through 11.11 may allow local users to execute arbitrary code by calling wall with a large file as an argument.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5439
https://exchange.xforce.ibmcloud.com/vulnerabilities/11272
http://www.securityfocus.com/bid/6800