TRENDnet TEW-827DRU devices through 2.06B04 contain a stack-based buffer overflow in the ssi binary. The overflow allows an authenticated user to execute arbitrary code by POSTing to apply.cgi via the action wizard_ipv6 with a sufficiently long reboot_type key.
https://github.com/HouseFuzz/reports/blob/main/trendnet/TEW827/wizard_ipv6/wizard_ipv6.md