From securityaffairs.co
Researchers at SIDN Labs (the R&D team of the registry for .nl domains), InternetNZ (the registry for .nz domains), and the Information Science Institute at the University of Southern California has discovered a vulnerability, named TsuNAME, in some DNS resolvers.
The flaw can be exploited by attackers to launch distributed denial-of-service (DDoS) attacks against authoritative DNS servers.