Vulnerability-Lookup

CVE-2026-16771 (GCVE-0-2026-16771)

Vulnerability from cvelistv5 – Published: 2026-07-28 18:21 – Updated: 2026-07-28 19:31

Title

CVE-2026-16771

Summary

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.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-306 Missing Authentication for Critical Function
CWE-306 - Missing Authentication for Critical Function

Assigner

certcc

References

2 references

URL	Tags
https://kb.cert.org/vuls/id/141367
https://www.kb.cert.org/vuls/id/141367

Impacted products

1 product

Vendor	Product	Version
AT&T	Arris BGW210‑700	Affected: 0 , ≤ 2.7.7 (custom)

Show details on NVD website

JSON

To clipboard

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            "url": "https://www.kb.cert.org/vuls/id/141367"
          }
        ],
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      }
    ],
    "cna": {
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          "vendor": "AT\u0026T",
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        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
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      },
      "references": [
        {
          "url": "https://kb.cert.org/vuls/id/141367"
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    "dateReserved": "2026-07-23T16:36:49.550Z",
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    "state": "PUBLISHED"
  },
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GHSA-8RCQ-GM95-4HQG

Vulnerability from github – Published: 2026-07-28 21:31 – Updated: 2026-07-28 21:31

Details

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-16771"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-28T19:17:32Z",
    "severity": "HIGH"
  },
  "details": "In firmware versions 2.7.7 and earlier, the Arris BGW210\u2011700 gateway fails to enforce any server\u2011side authentication on its /cgi-bin/*.ha management endpoints, relying solely on client\u2011side 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.",
  "id": "GHSA-8rcq-gm95-4hqg",
  "modified": "2026-07-28T21:31:31Z",
  "published": "2026-07-28T21:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-16771"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/141367"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/141367"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-16771 (GCVE-0-2026-16771)

GHSA-8RCQ-GM95-4HQG

Tags

Sightings

Nomenclature