An issue was discovered on Intelbras WRN 150 1.0.17 devices. There is stored XSS in the Service Name tab of the WAN configuration screen, leading to a denial of service (inability to change the configuration).
Intelbras WRN 150 devices allow remote attackers to read the configuration file, and consequently bypass authentication, via a direct request for cgi-bin/DownloadCfg/RouterCfm.cfg containing an admin:language=pt cookie.