Vulnerability intelligence

CVE-2026-16771

AT&T Arris BGW210‑700

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.

CVSS Score

8.8

High

EPSS — Exploit Probability

0.4%

Riskier than 28% of all CVEs · checked 2026-09-12

Exploitation

Not in CISA KEV

KEV does not include every exploited vulnerability

Remediation

unknown

Check vendor advisories

NVD entry PoC / advisory

1 article across 1 outlet · first covered Jul 31, 2026 · latest Jul 31, 2026

Coverage timeline

Arris BGW210 700 flaw lets attackers bypass AT&T gateway auth
securityonline.info · Jul 31, 2026