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
HIGHPre-NVD 8.88.8—Trending — 4 sources updated this week
EchelonGraph scoreHIGH confidence
Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, ghsa
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 8.8Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.8
- EG Score
- 8.8(high)
- EG Risk
- 44(Track)EG Risk 44/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity88% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- —
- EPSS %ILE
- —
- KEV
- Not listed
Published
July 28, 2026
Last Modified
July 28, 2026
Advisory Details (2)
Auto-updated Jul 28, 2026No patch confirmed yet. Sources: cert.
cert
VU#141367 - AT&T's Arris BGW210-700 gateway contains authentication bypass vulnerability in LAN-side management interface
https://www.kb.cert.org/vuls/id/141367cert
VU#141367 - AT&T's Arris BGW210-700 gateway contains authentication bypass vulnerability in LAN-side management interface
https://kb.cert.org/vuls/id/141367Vendor Advisories for CVE-2026-16771(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-29 09:25 UTCEG score recompute
- 2026-07-29 09:25 UTCGHSA enrichment
- 2026-07-28 20:26 UTCEG score recompute▲ 8.80
- 2026-07-28 20:24 UTCNVD updateCVSS v3 → 8.8 · severity → HIGH
- 2026-07-28 19:24 UTCNVD update
- 2026-07-28 18:59 UTCEG score recompute
- 2026-07-28 18:57 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-306
- CVE-2011-10013EG 10.0CRITICAL
- CVE-2014-125124EG 10.0CRITICAL
- CVE-2017-2637EG 10.0EPSS p91CRITICAL
- CVE-2010-5326EG 10.0 KEVEPSS p97CRITICAL
- CVE-2007-0956EG 10.0EPSS p98HIGH
- CVE-2017-12822EG 9.9CRITICAL
- CVE-2016-8355EG 9.9CRITICAL
- CVE-2012-10030EG 9.8CRITICAL
- CVE-2014-3449EG 9.8CRITICAL
- CVE-2006-0062EG 9.8CRITICAL
Frequently asked(4)
What is CVE-2026-16771?
CVE-2026-16771 is a high vulnerability published on July 28, 2026. 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…
When was CVE-2026-16771 disclosed?
CVE-2026-16771 was first published in the National Vulnerability Database on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-16771?
CVE-2026-16771 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16771?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16771, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-16771
Is Your Infrastructure Affected by CVE-2026-16771?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.