BIND through versions 9.8.8, 9.9.13, 9.10.8, 9.11.4, 9.12.2 and 9.13.2 have a flaw in the "deny-answer-aliases" feature that can cause an INSIST assertion failure in named. A remote attacker could exploit this to cause named to crash. https://nvd.nist.gov/vuln/detail/CVE-2018-5740