Intelbras WRN240 devices do not require authentication to replace the firmware via a POST request to the incoming/Firmware.cfg URI.
https://fireshellsecurity.team/hack-n-routers/
http://packetstormsecurity.com/files/156589/Intelbras-Wireless-N-150Mbps-WRN240-Authentication-Bypass.html
Source: Mitre, NVD
Published: 2020-01-17
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Severity: High
EPSS: 0.10441