easyMINE before 2019-12-05 ships with SSH host keys baked into the installation image, which allows man-in-the-middle attacks and makes identification of all public IPv4 nodes trivial with Shodan.io.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-19751
• https://blog.easymine.io
• https://rsaxvc.net/blog/2020/4/10/Widespread_re-use_of_SSH_Host_Keys_in_Ethereum_Mining_Rig_Operating_Systems.html