Swissphone DiCal-RED 4009 devices allow a remote attacker to gain read access to almost the whole file system via anonymous FTP.
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2024-036.txt
https://www.swissphone.com/en-us/solutions/components/terminals/radio-data-module-dical-red/