CVE-2026-16771

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{"affected": [{"affectedData": [{"product": "Arris BGW210\u2011700", "vendor": "AT&T", "versions": [{"lessThanOrEqual": "2.7.7", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "cret@cert.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "En las versiones de firmware 2.7.7 y anteriores, el gateway Arris BGW210?700 no aplica ninguna autenticaci\u00f3n del lado del servidor en sus puntos finales de gesti\u00f3n /cgi-bin/*.ha, confiando \u00fanicamente en la restricci\u00f3n CSS/JavaScript del lado del cliente que puede ser eludida por cualquier cliente HTTP. Esto permite a atacantes no autenticados en la LAN leer datos de configuraci\u00f3n sensibles, modificar configuraciones persistentes del dispositivo o activar operaciones de diagn\u00f3stico de backend. El problema parece sist\u00e9mico en toda la cadena de gestores CGI."}], "id": "CVE-2026-16771", "lastModified": "2026-10-23T23:10:00.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-16771", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-28T18:58:28.079223Z", "version": "2.0.3"}}]}, "published": "2026-07-28T19:17:32.247", "references": [{"source": "cret@cert.org", "url": "https://kb.cert.org/vuls/id/141367"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/141367"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-306"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,2.7.7]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Arris BGW210\u2011700", "source": "cna", "vendor": "AT&T"}, "product": "arris_bgw210\u2011700", "vendor": "at&t"}], "created": "2026-07-28T20:38:33.701208+00:00", "title": "Unauthenticated Access to Management Endpoints on Arris BGW210-700 Router", "updated": "2026-08-04T13:00:11.540897+00:00", "vendors": ["at&t", "at&t$PRODUCT$arris_bgw210\u2011700"]}