An issue has been found in the API component of PowerDNS Authoritative,where some operations that have an impact on the state of the server are still allowed even though the API has been configured as read-only via the `api-readonly` keyword.This missing check allows an attacker with valid API credentials could flush the cache, trigger a zone transfer or send a NOTIFY. Affects:¶ PowerDNS Authoritative up to and including 4.0.4, 3.4.11 Not affected:¶ PowerDNS Authoritative 4.0.5