Adtran 411 ONT L80.00.0011.M2 was discovered to contain weak default passwords.
https://lanrat.com/posts/adtran-isp-hacking/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-8766
https://drive.google.com/file/d/1levaZk5aC6g6a2zPW8xlOIVAu9MFYvAz/view