From securityaffairs.co
![tsuname](https://i1.wp.com/securityaffairs.co/wordpress/wp-content/uploads/2021/05/tsuname-flaw.png?resize=521%2C233&ssl=1)
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.