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New TsuNAME Flaw Could Let Attackers Take Down Authoritative DNS Servers

Security researchers Thursday disclosed a new critical vulnerability affecting Domain Name System (DNS) resolvers that could be exploited by adversaries to carry out reflection-based denial-of-service attacks against authoritative nameservers. The flaw, called’TsuNAME,' was discovered by researchers from SIDN Labs and InternetNZ, which manage the national top-level internet domains ‘.nl’ and ‘.