While query forwarding and QNAME minimization are mutually incompatible, BIND did sometimes allow QNAME minimization when continuing with recursion after ‘forward first’ did not result in an answer. In these cases the data used by QNAME minimization might be inconsistent, leading to an assertion failure, causing the server to exit. (CVE-2020-8621)
Impact
There is no impact; F5 products are not affected by this vulnerability.