Unspecified vulnerability in xntpd of HP-UX 10.20 through 11.11 allows remote attackers to cause a denial of service (hang) via unknown attack vectors.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4959
https://exchange.xforce.ibmcloud.com/vulnerabilities/10836