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

Summary

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. The device exposes a browser-based management interface on the local-area network (LAN) side... Related CVEs: CVE-2026-16771.

Why it matters

CERT/CC notes often cover coordinated disclosures, multi-vendor exposure, infrastructure risk, or cases where remediation guidance is still developing.

Operator check

Review the CERT/CC Vulnerability Note and compare the affected vendor and product list against your inventory. Apply vendor fixes or compensating controls for management interface where available.

Sources