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CVE-2021-27705

Estado: ModificadaCrítica (9.8)—

Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"qosIndex "request. This occurs because the "formQOSRuleDel" function directly passes the parameter "qosIndex" to strcpy without limit.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Tenda — G1 FirmwareTenda — G3 Firmware

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-27705",
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        "source": "nvd@nist.gov",
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          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
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          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 3.9
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  "affected": [
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      "affectedData": [
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          "product": "n/a",
          "versions": [
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              "status": "affected",
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  "published": "2021-04-14T15:15:13.970",
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      "tags": [
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        "Third Party Advisory"
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      "description": [
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          "lang": "en",
          "value": "CWE-120"
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      "value": "Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/\"qosIndex \"request. This occurs because the \"formQOSRuleDel\" function directly passes the parameter \"qosIndex\" to strcpy without limit."
    },
    {
      "lang": "es",
      "value": "Un desbordamiento de búfer en los enrutadores Tenda versiones G1 y G3 con firmware v15.11.0.17(9502) _CN, permite a atacantes remotos ejecutar código arbitrario por medio de una petición diseñada action/\"qosIndex\". Esto ocurre porque la función \"formQOSRuleDel\" pasa directamente el parámetro \"qosIndex\" a strcpy sin límite"
    }
  ],
  "lastModified": "2026-06-17T03:45:21.953",
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