CVE-2026-16771
HIGHAt&t Arris BGW210‑700 < 2.7.7 - Missing Authentication for Critical Function
Title source: ruleDescription
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.
References (2)
Core 2
Core References
Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/141367
Scores
CVSS v3
8.8
EPSS
0.0025
EPSS Percentile
16.5%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-306
Status
published
Products (1)
AT&T/Arris BGW210‑700
< 2.7.7
Published
Jul 28, 2026
Tracked Since
Jul 29, 2026