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CVE-2025-20212

Estado: AplazadaAlta (7.7)—

A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device.

This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with an affected device.

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A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN sessions and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.

Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers without manual intervention.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vector CVSS requiere PR:L (autenticado) y AV:N; texto describe caída del servicio VPN mediante sesiones SSL crafted. DoS de servicio remoto (T1499.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Tecnologías afectadas (3)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Cisco — AnyconnectAICisco — Meraki MXAICisco — Meraki Z SeriesAI

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-20212",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-20212",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-04-02T16:34:22.896705Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "psirt@cisco.com",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.7,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4,
        "exploitabilityScore": 3.1
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "Cisco",
          "product": "Cisco Meraki MX Firmware",
          "versions": [
            {
              "status": "affected",
              "version": "16.2"
            },
            {
              "status": "affected",
              "version": "16.3"
            },
            {
              "status": "affected",
              "version": "16.4"
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            {
              "status": "affected",
              "version": "16.5"
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              "version": "16.6"
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            {
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              "version": "17.3"
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            {
              "status": "affected",
              "version": "17.6"
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            {
              "status": "affected",
              "version": "17.7"
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            {
              "status": "affected",
              "version": "17.8"
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            {
              "status": "affected",
              "version": "17.9"
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            {
              "status": "affected",
              "version": "17.10"
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  ],
  "published": "2025-04-02T17:15:44.323",
  "references": [
    {
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-vNRpDvfb",
      "source": "psirt@cisco.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "psirt@cisco.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-457"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series devices could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. To exploit this vulnerability, the attacker must have valid VPN user credentials on the affected device.\r\n\r This vulnerability exists because a variable is not initialized when an SSL VPN session is established. An attacker could exploit this vulnerability by supplying crafted attributes while establishing an SSL VPN session with an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of the established SSL VPN sessions and forcing remote users to initiate a new VPN connection and reauthenticate. A sustained attack could prevent new SSL VPN connections from being established.\r\n\r Note: When the attack traffic stops, the Cisco AnyConnect VPN server recovers without manual intervention."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el servidor VPN Cisco AnyConnect de los dispositivos Cisco Meraki MX y Cisco Meraki Z Series podría permitir que un atacante remoto autenticado provoque una denegación de servicio (DoS) en el servicio Cisco AnyConnect de un dispositivo afectado. Para explotar esta vulnerabilidad, el atacante debe tener credenciales de usuario VPN válidas en el dispositivo afectado. Esta vulnerabilidad existe porque una variable no se inicializa al establecer una sesión VPN SSL. Un atacante podría aprovechar esta vulnerabilidad proporcionando atributos manipulados al establecer una sesión VPN SSL con un dispositivo afectado. Una explotación exitosa podría permitir al atacante reiniciar el servidor VPN Cisco AnyConnect, lo que provocaría el fallo de las sesiones VPN SSL establecidas y obligaría a los usuarios remotos a iniciar una nueva conexión VPN y a autenticarse de nuevo. Un ataque continuo podría impedir el establecimiento de nuevas conexiones VPN SSL. Nota: Cuando el tráfico del ataque se detiene, el servidor VPN Cisco AnyConnect se recupera sin intervención manual."
    }
  ],
  "lastModified": "2026-06-17T08:41:05.470",
  "sourceIdentifier": "psirt@cisco.com"
}