CVE-2026-11405

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{"affected": [{"affectedData": [{"product": "firmware", "vendor": "Tenda", "versions": [{"status": "affected", "version": "US_AC6V2.0RTL_V15.03.06.51_multi_T"}]}, {"product": "firmware", "vendor": "Tenda", "versions": [{"status": "affected", "version": "US_AC5V1.0RTL_V15.03.06.48_multi_TDE01"}]}, {"product": "firmware", "vendor": "Tenda", "versions": [{"status": "affected", "version": "US_AC10V1.0re_V15.03.06.46_multi_TDE01"}]}, {"product": "firmware", "vendor": "Tenda", "versions": [{"status": "affected", "version": "US_W15EV1.0br_V15.11.0.5(1068_1567_841)_EN_TDE"}]}, {"product": "firmware", "vendor": "Tenda", "versions": [{"status": "affected", "version": "US_FH1201V1.0BR_V1.2.0.14(408)_EN_TD"}]}], "source": "cret@cert.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The web server binary /bin/httpd contains a hidden backdoor authentication mechanism in the login() function at 004c88b8.\r\n\r\n- The function contains a normal authentication path using MD5/hash-based password verification (prod_encode64/PasswordToMd5/check_rand_key).\r\n- After normal authentication fails, it calls GetValue(\"sys.rzadmin.password\") to read a backdoor password from the device configuration.\r\n- It performs a direct strcmp() comparison (plaintext, not hashed) between the config value and the user-supplied password.\r\n\r\nA successful match grants role=2 (admin-level access) and creates a valid session. The rzadmin username is never checked \u2014 any username works with the backdoor"}, {"lang": "es", "value": "El binario del servidor web /bin/httpd contiene un mecanismo de autenticaci\u00f3n de puerta trasera oculto en la funci\u00f3n login() en 004c88b8.\n\n- La funci\u00f3n contiene una ruta de autenticaci\u00f3n normal utilizando verificaci\u00f3n de contrase\u00f1a basada en MD5/hash (prod_encode64/PasswordToMd5/check_rand_key).\n- Despu\u00e9s de que la autenticaci\u00f3n normal falla, llama a GetValue(\u2019sys.rzadmin.password\u2019) para leer una contrase\u00f1a de puerta trasera de la configuraci\u00f3n del dispositivo.\n- Realiza una comparaci\u00f3n strcmp() directa (texto plano, no hasheado) entre el valor de configuraci\u00f3n y la contrase\u00f1a proporcionada por el usuario.\n\nUna coincidencia exitosa otorga rol=2 (acceso a nivel de administrador) y crea una sesi\u00f3n v\u00e1lida. El nombre de usuario rzadmin nunca se verifica - cualquier nombre de usuario funciona con la puerta trasera"}], "id": "CVE-2026-11405", "lastModified": "2026-10-25T20:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11405", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-08T03:56:43.961536Z", "version": "2.0.3"}}]}, "published": "2026-07-06T20:16:29.450", "references": [{"source": "cret@cert.org", "url": "https://cwe.mitre.org/data/definitions/912.html"}, {"source": "cret@cert.org", "url": "https://kb.cert.org/vuls/id/213560"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/213560"}], "sourceIdentifier": "cret@cert.org", "vulnStatus": "Deferred"}

{}

{"created": "2026-07-07T05:45:03.214284+00:00", "updated": "2026-08-05T03:00:13.326862+00:00", "vendors": [], "weaknesses": ["CWE-287"]}