In this video I cover a newly discovered vulnerability in lets encrypts multi perspective domain validation mechanism. That may allow an attacker to force the use of a compromised nameserver.

Read more about this exploit
https://i.blackhat.com/USA21/Wednesday-Handouts/US-21-Shulman-Lets-Attack-Lets_Encrypt.pdf

How insecure deployments of BGP can be exploited.
https://www.princeton.edu/~pmittal/publications/bgp-tls-usenix18.pdf

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https://www.youtube.com/watch?v=9KsXiSvxtUM