CVE-2026-16771

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
8.8
EG Score
8.8(medium)
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 computed
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
No 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/141367
cert

VU#141367 - AT&T's Arris BGW210-700 gateway contains authentication bypass vulnerability in LAN-side management interface

https://kb.cert.org/vuls/id/141367

Vendor 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 22× in last 7d / 93× 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.

Showing the most recent 100 of 168 total refreshes for this CVE.

  1. 2026-09-15 08:36 UTCEG score recompute
  2. 2026-09-15 08:36 UTCGHSA enrichment
  3. 2026-09-14 04:39 UTCEG score recompute
  4. 2026-09-14 04:39 UTCGHSA enrichment
  5. 2026-09-13 16:46 UTCEPSS rescore
  6. 2026-09-13 15:41 UTCGHSA enrichment
  7. 2026-09-13 02:36 UTCEG score recompute
  8. 2026-09-13 02:36 UTCGHSA enrichment
  9. 2026-09-12 15:00 UTCEPSS rescore
  10. 2026-09-12 13:37 UTCGHSA enrichment
  11. 2026-09-12 00:39 UTCEG score recompute
  12. 2026-09-12 00:39 UTCGHSA enrichment
  13. 2026-09-11 14:52 UTCEPSS rescore
  14. 2026-09-11 09:36 UTCEG score recompute
  15. 2026-09-11 09:36 UTCGHSA enrichment
  16. 2026-09-11 09:36 UTCEPSS rescore
  17. 2026-09-10 20:37 UTCEG score recompute
  18. 2026-09-10 20:37 UTCGHSA enrichment
  19. 2026-09-10 09:34 UTCEPSS rescore
  20. 2026-09-10 07:39 UTCGHSA enrichment
  21. 2026-09-09 07:59 UTCEG score recompute
  22. 2026-09-09 07:59 UTCGHSA enrichment
  23. 2026-09-08 22:00 UTCEPSS rescore
  24. 2026-09-07 20:54 UTCEG score recompute
  25. 2026-09-07 20:54 UTCGHSA enrichment
Show 75 more
  1. 2026-09-07 16:01 UTCEPSS rescore
  2. 2026-09-06 23:13 UTCEG score recompute
  3. 2026-09-06 23:13 UTCGHSA enrichment
  4. 2026-09-06 13:47 UTCEPSS rescore
  5. 2026-09-06 08:07 UTCGHSA enrichment
  6. 2026-09-05 19:09 UTCEG score recompute
  7. 2026-09-05 19:09 UTCGHSA enrichment
  8. 2026-09-05 05:30 UTCEG score recompute
  9. 2026-09-05 05:30 UTCGHSA enrichment
  10. 2026-09-04 11:59 UTCEG score recompute
  11. 2026-09-04 11:59 UTCGHSA enrichment
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 14:11 UTCEPSS rescore
  14. 2026-09-01 22:51 UTCEG score recompute
  15. 2026-09-01 22:51 UTCGHSA enrichment
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
  18. 2026-09-01 00:45 UTCGHSA enrichment
  19. 2026-08-31 01:28 UTCEG score recompute
  20. 2026-08-31 01:28 UTCGHSA enrichment
  21. 2026-08-30 19:17 UTCEPSS rescore
  22. 2026-08-30 12:29 UTCEG score recompute
  23. 2026-08-30 12:29 UTCGHSA enrichment
  24. 2026-08-30 01:22 UTCEPSS rescore
  25. 2026-08-29 23:30 UTCEG score recompute
  26. 2026-08-29 23:30 UTCGHSA enrichment
  27. 2026-08-28 21:41 UTCEPSS rescore
  28. 2026-08-27 23:54 UTCEG score recompute
  29. 2026-08-27 23:54 UTCGHSA enrichment
  30. 2026-08-27 14:25 UTCEPSS rescore
  31. 2026-08-27 10:56 UTCGHSA enrichment
  32. 2026-08-26 21:58 UTCEG score recompute
  33. 2026-08-26 21:58 UTCGHSA enrichment
  34. 2026-08-26 14:46 UTCEPSS rescore
  35. 2026-08-26 08:54 UTCGHSA enrichment
  36. 2026-08-25 19:53 UTCEG score recompute
  37. 2026-08-25 19:53 UTCGHSA enrichment
  38. 2026-08-25 13:48 UTCEPSS rescore
  39. 2026-08-25 06:55 UTCGHSA enrichment
  40. 2026-08-24 17:56 UTCEG score recompute
  41. 2026-08-24 17:56 UTCGHSA enrichment
  42. 2026-08-24 04:28 UTCGHSA enrichment
  43. 2026-08-23 15:29 UTCGHSA enrichment
  44. 2026-08-23 02:30 UTCEG score recompute
  45. 2026-08-23 02:30 UTCGHSA enrichment
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 13:31 UTCGHSA enrichment
  48. 2026-08-22 00:30 UTCEG score recompute
  49. 2026-08-22 00:30 UTCGHSA enrichment
  50. 2026-08-21 23:49 UTCEPSS rescore
  51. 2026-08-21 11:31 UTCEG score recompute
  52. 2026-08-21 11:31 UTCGHSA enrichment
  53. 2026-08-20 22:55 UTCEPSS rescore
  54. 2026-08-20 22:31 UTCGHSA enrichment
  55. 2026-08-20 09:33 UTCGHSA enrichment
  56. 2026-08-19 20:35 UTCEG score recompute
  57. 2026-08-19 20:35 UTCGHSA enrichment
  58. 2026-08-19 17:03 UTCEPSS rescore
  59. 2026-08-19 07:36 UTCGHSA enrichment
  60. 2026-08-18 18:38 UTCEG score recompute
  61. 2026-08-18 18:38 UTCGHSA enrichment
  62. 2026-08-18 13:48 UTCEPSS rescore
  63. 2026-08-18 04:24 UTCGHSA enrichment
  64. 2026-08-17 15:26 UTCEG score recompute
  65. 2026-08-17 15:26 UTCGHSA enrichment
  66. 2026-08-17 13:47 UTCEPSS rescore
  67. 2026-08-17 02:28 UTCEG score recompute
  68. 2026-08-17 02:28 UTCGHSA enrichment
  69. 2026-08-16 14:56 UTCEPSS rescore
  70. 2026-08-16 13:30 UTCEG score recompute
  71. 2026-08-16 13:30 UTCGHSA enrichment
  72. 2026-08-16 02:14 UTCEPSS rescore
  73. 2026-08-16 00:32 UTCGHSA enrichment
  74. 2026-08-15 11:34 UTCEG score recompute
  75. 2026-08-15 11:34 UTCGHSA enrichment

Frequently asked(5)

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, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16771 actively exploited?
CVE-2026-16771 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.5% of all scored CVEs.
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.

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