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CVE-2021-35034

Estado: ModificadaCrítica (9.1)—

An insufficient session expiration vulnerability in the CGI program of the Zyxel NBG6604 firmware could allow a remote attacker to access the device if the correct token can be intercepted.

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)

Zyxel — Nbg6604 Firmware

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-35034",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
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        "type": "Primary",
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        "impactScore": 5.2,
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  "affected": [
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      "affectedData": [
        {
          "vendor": "Zyxel",
          "product": "NBG6604 series firmware",
          "versions": [
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              "status": "affected",
              "version": "1.00(ABIR.8)C0"
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  "published": "2021-12-29T13:15:07.803",
  "references": [
    {
      "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_sensitive_information_vulnerabilities_of_NBG6604_home_router.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@zyxel.com.tw"
    },
    {
      "url": "https://www.zyxel.com/support/Zyxel_security_advisory_for_sensitive_information_vulnerabilities_of_NBG6604_home_router.shtml",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@zyxel.com.tw",
      "description": [
        {
          "lang": "en",
          "value": "CWE-613"
        }
      ]
    },
    {
      "type": "Primary",
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      "description": [
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          "value": "CWE-613"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An insufficient session expiration vulnerability in the CGI program of the Zyxel NBG6604 firmware could allow a remote attacker to access the device if the correct token can be intercepted."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de caducidad de sesión insuficiente en el programa CGI del firmware Zyxel NBG6604 podría permitir a un atacante remoto acceder al dispositivo si es posible interceptar el token correcto"
    }
  ],
  "lastModified": "2026-06-17T03:57:01.050",
  "configurations": [
    {
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        {
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  "sourceIdentifier": "security@zyxel.com.tw"
}