CVE-2026-16771: CWE-306 Missing Authentication for Critical Function in 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.
CVE-2026-16771: CWE-306 Missing Authentication for Critical Function in AT&T Arris BGW210‑700
Description
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 v3.1
Score 8.8high
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- certcc
- Date Reserved
- 2026-07-23T16:36:49.550Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://kb.cert.org/vuls/id/141367","vendor":"CERT"}]
Threat ID: 6a68fdfc9c2644c7f8116816
Added to database: 07/28/2026, 19:07:40 UTC
Last updated: 07/29/2026, 02:37:44 UTC
Views: 10
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