CVE-2016-6172
PowerDNS (aka pdns) Authoritative Server before 4.0.1 allows remote primary DNS servers to cause a denial of service (memory exhaustion and secondary DNS server crash) via a large (1) AXFR or (2) IXFR response.
Date published : 2016-09-26
http://www.securityfocus.com/bid/91678
https://doc.powerdns.com/md/changelog/#powerdns-authoritative-server-401