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CVE-2021-1420

Estado: ModificadaMedia (4.7)—

A vulnerability in certain web pages of Cisco Webex Meetings could allow an unauthenticated, remote attacker to modify a web page in the context of a user's browser. The vulnerability is due to improper checks on parameter values in affected pages. An attacker could exploit this vulnerability by persuading a user to follow a crafted link that is designed to pass HTML code into an affected parameter. A successful exploit could allow the attacker to alter the contents of a web page to redirect the user to potentially malicious websites, or the attacker could use this vulnerability to conduct further client-side attacks.

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)

Cisco — Webex Meetings

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-1420",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-1420",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-08T20:45:50.789434Z"
        }
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    "cvssMetricV2": [
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
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        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
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    "cvssMetricV31": [
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  "published": "2021-04-08T04:15:13.327",
  "references": [
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      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-VObwRKWV",
      "tags": [
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  "weaknesses": [
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      "description": [
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          "value": "CWE-80"
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      "lang": "en",
      "value": "A vulnerability in certain web pages of Cisco Webex Meetings could allow an unauthenticated, remote attacker to modify a web page in the context of a user's browser. The vulnerability is due to improper checks on parameter values in affected pages. An attacker could exploit this vulnerability by persuading a user to follow a crafted link that is designed to pass HTML code into an affected parameter. A successful exploit could allow the attacker to alter the contents of a web page to redirect the user to potentially malicious websites, or the attacker could use this vulnerability to conduct further client-side attacks."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en determinadas páginas web de Cisco Webex Meetings, podría permitir a un atacante remoto no autenticado modificar una página web en el contexto del navegador de un usuario. La vulnerabilidad es debido a comprobaciones inapropiadas de los valores de los parámetros en páginas afectadas. Un atacante podría explotar esta vulnerabilidad al persuadir a un usuario para seguir un vínculo elaborado que está diseñado para pasar código HTML a un parámetro afectado. Una explotación con éxito podría permitir al atacante alterar el contenido de una página web para redireccionar al usuario a sitios web potencialmente maliciosos, o el atacante podría usar esta vulnerabilidad para conducir más ataques del lado del cliente"
    }
  ],
  "lastModified": "2026-06-17T03:31:44.080",
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