CVE-2026-16771

In firmware versions 2.7.7 and earlier, the Arris BGW210‑700 gateway fails to enforce any server‑side authentication on its /cgi-bin/.ha management endpoints, relying solely on client‑side CSS/JavaScript gating that can be bypassed by any HTTP client. This allows unauthenticated attackers on the...

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...