CVE-2026-16771: High severity Arris BGW210-700 gateway vulnerability
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 LAN to read sensitive configuration data, modify persistent device settings, or trigger backend diagnostic operations. The issue appears systemic across the CGI handler chain.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-16771?
CVE-2026-16771 has a risk rating of 71, indicating a significant vulnerability.
How do I fix CVE-2026-16771?
To fix CVE-2026-16771, upgrade to firmware version 2.7.8 or later that enforces server-side authentication.
What kind of attacks can be performed due to CVE-2026-16771?
CVE-2026-16771 allows unauthenticated attackers to access management endpoints and potentially manipulate settings on the gateway.
What devices are affected by CVE-2026-16771?
CVE-2026-16771 affects the Arris BGW210‑700 gateway running firmware versions 2.7.7 and earlier.
Is CVE-2026-16771 a remote or local vulnerability?
CVE-2026-16771 is a remote vulnerability since it can be exploited by attackers over the local area network.