{
  "id": "CVE-2020-3509",
  "sourceIdentifier": "ykramarz@cisco.com",
  "published": "2020-09-24T18:15:21.073",
  "lastModified": "2020-10-08T18:16:58.230",
  "vulnStatus": "Analyzed",
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause the supervisor to crash, which could result in a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are parsed. An attacker could exploit this vulnerability by sending a malicious DHCPv4 message to or through a WAN interface of an affected device. A successful exploit could allow the attacker to cause a reload of the affected device. Note: On Cisco cBR-8 Converged Broadband Routers, all of the following are considered WAN interfaces: 10 Gbps Ethernet interfaces 100 Gbps Ethernet interfaces Port channel interfaces that include multiple 10 and/or 100 Gbps Ethernet interfaces"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en el manejador de mensajes DHCP de Cisco IOS XE Software para Cisco cBR-8 Converged Broadband Routers, podr\u00eda permitir a un atacante remoto no autenticado causar que el supervisor se bloquee, lo que podr\u00eda resultar en una condici\u00f3n de denegaci\u00f3n de servicio (DoS). La vulnerabilidad es debido a un manejo insuficiente de errores cuando son analizados los mensajes de DHCP versi\u00f3n 4 (DHCPv4). Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de un mensaje DHCPv4 malicioso o mediante una interfaz WAN de un dispositivo afectado. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar una recarga del dispositivo afectado. Nota: En Cisco cBR-8 Converged Broadband Routers, todos los siguientes son considerados interfaces WAN: Interfaces Ethernet de 10 Gbps, Interfaces Ethernet de 100 Gbps Interfaces de canal de puerto que incluyen m\u00faltiples interfaces Ethernet de 10 y/o 100 Gbps."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0
      }
    ],
    "cvssMetricV30": [
      {
        "source": "ykramarz@cisco.com",
        "type": "Secondary",
        "cvssData": {
          "version": "3.0",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 8.6,
          "baseSeverity": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.0
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "accessVector": "NETWORK",
          "accessComplexity": "LOW",
          "authentication": "NONE",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.8
        },
        "baseSeverity": "HIGH",
        "exploitabilityScore": 10.0,
        "impactScore": 6.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-203"
        }
      ]
    },
    {
      "source": "ykramarz@cisco.com",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-388"
        }
      ]
    }
  ],
  "configurations": [
    {
      "operator": "AND",
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:cisco:ios_xe:16.7\\(1\\):*:*:*:*:*:*:*",
              "matchCriteriaId": "24A0A74F-82C8-4FE2-9D8B-97C2ED47AF50"
            }
          ]
        },
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": false,
              "criteria": "cpe:2.3:h:cisco:cbr-8:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "AB77D0EC-A448-4D97-8EB0-EA4956549A52"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-dhcp-dos-JSCKX43h",
      "source": "ykramarz@cisco.com",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}