stmkfont in HP-UX B.11.00 through B.11.23 relies on the user-specified PATH when executing certain commands, which allows local users to execute arbitrary code by modifying the PATH environment variable to point to malicious programs.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5538
https://exchange.xforce.ibmcloud.com/vulnerabilities/17813
http://www.securityfocus.com/bid/11493
http://www.securityfocus.com/advisories/7351