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CVE-2021-21739

Estado: ModificadaMedia (4.6)—

A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: <ZXCTN 6120H><V5.10.00B24>

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)

ZTE — Zxctn 6120h Firmware

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2021-21739",
  "cveTags": [],
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 2.1,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
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          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
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  "affected": [
    {
      "source": "psirt@zte.com.cn",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "<ZXCTN 6120H>",
          "versions": [
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  "published": "2021-08-05T20:15:07.703",
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      "url": "https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1017024",
      "tags": [
        "Vendor Advisory"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-345"
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      "value": "A ZTE's product of the transport network access layer has a security vulnerability. Because the system does not sufficiently verify the data reliability, attackers could replace an authenticated optical module on the equipment with an unauthenticated one, bypassing system authentication and detection, thus affecting signal transmission. This affects: <ZXCTN 6120H><V5.10.00B24>"
    },
    {
      "lang": "es",
      "value": "Un producto de ZTE de la capa de acceso a la red de transporte presenta una vulnerabilidad de seguridad. Debido a que el sistema no verifica suficientemente la fiabilidad de los datos, unos atacantes podrían sustituir un módulo óptico autenticado en el equipo por otro no autenticado, omitiendo la autentificación y detección del sistema, afectando así a la transmisión de la señal. Esto afecta a: "
    }
  ],
  "lastModified": "2026-06-17T03:36:04.173",
  "configurations": [
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