Lame delegations

Lame delegations occur as a result of expired nameserver domains allowing attackers to take control of the domain resolution by re-registering this expired nameserver domain.

https://blog.apnic.net/2021/03/16/the-prevalence-persistence-perils-of-lame-nameservers/

https://kb.isc.org/docs/lame-servers-what-are-they-and-how-does-bind-deal-with-them

Note: these are also known as “dangling delegations”, which is the most common form of attack involving lame delegations. It’s also possible that lame delegations might help to enable DoS attacks or compromises, which are covered elsewhere.