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CVE-2021-46394

Estado: ModificadaCrítica (9.8)—

There is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router V16.03.12.10_CN. The v13 variable is directly retrieved from the http request parameter startIp. Then v13 will be splice to stack by function sscanf without any security check, which causes stack overflow. By POSTing the page /goform/SetPptpServerCfg with proper startIp, the attacker can easily perform remote code execution with carefully crafted overflow data.

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 (1)

Tenda — AX3 Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-46394",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "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",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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          "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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        "impactScore": 5.9,
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  "affected": [
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      "affectedData": [
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              "status": "affected",
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  "published": "2022-03-04T14:15:07.853",
  "references": [
    {
      "url": "https://github.com/sec-bin/IoT-CVE/tree/main/Tenda/AX3/4",
      "tags": [
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        "Third Party Advisory"
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      "source": "cve@mitre.org"
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    {
      "url": "https://github.com/sec-bin/IoT-CVE/tree/main/Tenda/AX3/4",
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "There is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router V16.03.12.10_CN. The v13 variable is directly retrieved from the http request parameter startIp. Then v13 will be splice to stack by function sscanf without any security check, which causes stack overflow. By POSTing the page /goform/SetPptpServerCfg with proper startIp, the attacker can easily perform remote code execution with carefully crafted overflow data."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de desbordamiento del buffer de pila en la función formSetPPTPServer del router Tenda-AX3 versión V16.03.12.10_CN. La variable v13 es recuperada directamente del parámetro startIp de la petición http. Entonces v13 será empalmada a la pila por la función sscanf sin ninguna comprobación de seguridad, lo que causa un desbordamiento de la pila. Al enviar por POST la página /goform/SetPptpServerCfg con la startIp apropiada, el atacante puede llevar a cabo fácilmente una ejecución de código remota con datos de desbordamiento cuidadosamente diseñados"
    }
  ],
  "lastModified": "2026-06-17T04:14:50.960",
  "configurations": [
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  "sourceIdentifier": "cve@mitre.org"
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