PowerDNS Recursor versions 3.0 through 3.1.4 suffer form a DNS cache poisoning vulnerability.
You can download it from the following link: https://packetstormsecurity.com/files/download/65050/PowerDNS_recursor_DNS_Cache_Poisoning.pdf
Source: https://packetstormsecurity.com/files/65050/PowerDNS_recursor_DNS_Cache_Poisoning.pdf.html