An issue was discovered in Peplink Balance Two before 8.4.0. Console port authentication uses hard-coded credentials, which allows an attacker with physical access and sufficient knowledge to execute arbitrary commands as root.
https://www.synacktiv.com/sites/default/files/2023-12/synacktiv-peplink-multiple-vulnerabilities.pdf
https://www.synacktiv.com/publications%253Ffield_tags_target_id%253D4