The "file handling" in sort in HP-UX 10.01 through 10.20, and 11.00 through 11.11 is "incorrect," which allows attackers to gain access or cause a denial of service via unknown vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5758
https://exchange.xforce.ibmcloud.com/vulnerabilities/11107