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CVE-2009-0635

Estado: ModificadaAlta (7.1)—
Gravedad7.1Alta · CVSS 2.0
Probabilidad de explotación2.51 %mayor que el 85 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoNo conocidosin código público localizado

Perdida de memoria en la funcionalidad de encapsulado de Cisco Tunneling Control Protocol (cTCP) en Cisco IOS v12.4, cuando se ha habilitado un servidor Easy VPN (conocido como EZVPN), permite a atacantes remotos provocar una denegación de servicio (consumo de memoria y caída del dispositivo) mediante una secuencia de paquetes TCP.

CVSS

Puntuación base
7.1
Versión
2.0
Vector
AV:N/AC:M/Au:N/C:N/I:N/A:C

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
2.51 %
Percentil entre todas las CVEs puntuadas
85
Fecha de la puntuación
23/10/2026

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 — IOS

CWE

Referencias

Mostrar las 14 referencias

JSON original (NVD)

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{
  "id": "CVE-2009-0635",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-03-27T16:30:02.077",
  "references": [
    {
      "url": "http://secunia.com/advisories/34438",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/34246",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securitytracker.com/id?1021895",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2009/0851",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/49417",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://secunia.com/advisories/34438",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/34246",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id?1021895",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2009/0851",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/49417",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Memory leak in the Cisco Tunneling Control Protocol (cTCP) encapsulation feature in Cisco IOS 12.4, when an Easy VPN (aka EZVPN) server is enabled, allows remote attackers to cause a denial of service (memory consumption and device crash) via a sequence of TCP packets."
    },
    {
      "lang": "es",
      "value": "Perdida de memoria en la funcionalidad de encapsulado de Cisco Tunneling Control Protocol (cTCP) en Cisco IOS v12.4, cuando se ha habilitado un servidor Easy VPN (conocido como EZVPN), permite a atacantes remotos provocar una denegación de servicio (consumo de memoria y caída del dispositivo) mediante una secuencia de paquetes TCP."
    }
  ],
  "lastModified": "2026-06-16T23:05:27.873",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.4t:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BEAD7398-D1B2-47FB-952D-8C3162D5A363"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.4xz:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4963A243-74FA-43AD-9645-C9FAD527A6E1"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.4ya:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "31C6EACA-35BE-4032-93DA-5F738AEE0F4A"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "evaluatorSolution": "Per: http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml\r\n\r\n\r\nObtaining Fixed Software\r\n\r\nCisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.\r\n\r\nCustomers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml ."
}