The Huawei E355 adapter with firmware 21.157.37.01.910 does not require authentication for API pages which allows remote attackers to change passwords and settings or obtain sensitive information via a direct request to (1) api/wlan/security-settings (2) api/device/information (3) api/wlan/basic-settings (4) api/wlan/mac-filter (5) api/monitoring/status or (6) api/dhcp/settings.