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 wifi_captive_portal_login with a sufficiently long REMOTE_ADDR key.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14078
Reference (s):
- https://github.com/kuc001/IoTFirmware/blob/master/Trendnet/TEW-827/TRENDnet-wifi_captive.pdf
- https://github.com/kuc001/IoTFirmware/blob/master/Trendnet/TEW-827/wifi_captive_portal_login_overflow.pdf