RAD SecFlow-2 devices with Hardware 0202, Firmware 4.1.01.63, and U-Boot 2010.12 allow URIs beginning with /.. for Directory Traversal, as demonstrated by reading /etc/shadow.
https://www.cisa.gov/news-events/ics-advisories/icsa-24-170-01
https://www.owasp.org/index.php/Path_Traversal
https://packetstormsecurity.com/files/177440/RAD-SecFlow-2-Path-Traversal.html