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.

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Fixes

Solution

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Workaround

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References
History

Tue, 28 Jul 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared At&t
At&t arris Bgw210‑700
Vendors & Products At&t
At&t arris Bgw210‑700

Tue, 28 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-306
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 28 Jul 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title CVE-2026-16771
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: certcc

Published:

Updated: 2026-07-28T19:31:06.344Z

Reserved: 2026-07-23T16:36:49.550Z

Link: CVE-2026-16771

cve-icon Vulnrichment

Updated: 2026-07-28T19:31:06.344Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-28T20:38:33Z

Weaknesses