CVE-2025-20343

{
  "id": "CVE-2025-20343",
  "sourceIdentifier": "[email protected]",
  "published": "2025-11-05T17:15:37.443",
  "lastModified": "2026-10-18T21:10:00.120",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the RADIUS setting Reject RADIUS requests from clients with repeated failures on Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to cause Cisco ISE to restart unexpectedly.\r\n\r\nThis vulnerability is due to a logic error when processing a RADIUS access request for a MAC address that is already a rejected endpoint. An attacker could exploit this vulnerability by sending a specific sequence of multiple crafted RADIUS access request messages to Cisco ISE. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when Cisco ISE restarts."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la configuración RADIUS “Rechazar solicitudes RADIUS de clientes con fallos repetidos” en Cisco Identity Services Engine (ISE) podría permitir a un atacante remoto no autenticado causar que Cisco ISE se reinicie inesperadamente.\n\nEsta vulnerabilidad se debe a un error de lógica al procesar una solicitud de acceso RADIUS para una dirección MAC que ya es un endpoint rechazado. Un atacante podría explotar esta vulnerabilidad al enviar una secuencia específica de múltiples mensajes de solicitud de acceso RADIUS manipulados a Cisco ISE. Un exploit exitoso podría permitir al atacante causar una condición de denegación de servicio (DoS) cuando Cisco ISE se reinicia."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Cisco",
          "product": "Cisco Identity Services Engine Software",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "3.4.0",
              "status": "affected"
            },
            {
              "version": "3.4 Patch 1",
              "status": "affected"
            },
            {
              "version": "3.4 Patch 2",
              "status": "affected"
            },
            {
              "version": "3.4 Patch 3",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "baseScore": 8.6,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0
      },
      {
        "source": "[email protected]",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2025-11-05T20:06:45.616639Z",
          "id": "CVE-2025-20343",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-697"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.4.0:-:*:*:*:*:*:*",
              "matchCriteriaId": "D23905E0-E525-49B1-8E5F-4EB42D186768"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch1:*:*:*:*:*:*",
              "matchCriteriaId": "74509498-38EF-4345-9583-CEF5C26CA1D8"
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              "criteria": "cpe:2.3:a:cisco:identity_services_engine:3.4.0:patch2:*:*:*:*:*:*",
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  ],
  "references": [
    {
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-radsupress-dos-8YF3JThh",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}