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VU#141367: AT&T's Arris BGW210-700 gateway contains authentication bypass vulnerability in LAN-side management interface

Overview Firmware versions 2. 7. 7 and earlier of the Arris BGW210-700 residential gateway contain an authentication bypass vulnerability, tracked as CVE-2026-16771, that allows any unauthenticated LAN-side user to read sensitive configuration data and modify device settings through web management endpoints. Although this vulnerability was recently discovered, the majority of in-service gateways are not expected to be running the affected version. Only devices that have not received automated ISP-managed firmware updates since version 2. 7. 7 in 2020 are vulnerable. Description The Arris BGW210-700 is a residential gateway used widely in AT&T deployments to provide routing, wireless networking, and wide-area network (WAN) connectivity for home users.