🛡️ CVE-2026-16771

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-306 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-16771 is classified as CWE-306: Missing Authentication for Critical Function. A sensitive function can be reached without authenticating at all.

Affected software

CVE-2026-16771 is recorded against 1 package.

  • unknown

Timeline and source

Published on 28 July 2026 and last revised on 30 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

kb.cert.org
www.kb.cert.org

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-306
Public Exploit ✅ No
Source NVD
Published 2026-07-28
Updated 2026-08-11
Modified 2026-07-30
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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