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CVE-2015-4203

Estado: ModificadaMedia (5.4)—

Condición de carrera en Cisco IOS 12.2SCH en el módulo Performance Routing Engine (PRE) en los dispositivos uBR10000, cuando NetFlow y una VPN MPLS IPv6 están configurados, permite a atacantes remotos causar una denegación de servicio (caída del proceso PXF) mediante el envío rápido de paquetes MPLS 6VPE malformados, también conocida como Bug ID CSCud83396.

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 — IOS

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2015-4203",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "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": "2015-06-23T14:59:01.370",
  "references": [
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=39439",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/75339",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.securitytracker.com/id/1032692",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://tools.cisco.com/security/center/viewAlert.x?alertId=39439",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/75339",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securitytracker.com/id/1032692",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-362"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Race condition in Cisco IOS 12.2SCH in the Performance Routing Engine (PRE) module on uBR10000 devices, when NetFlow and an MPLS IPv6 VPN are configured, allows remote attackers to cause a denial of service (PXF process crash) by sending malformed MPLS 6VPE packets quickly, aka Bug ID CSCud83396."
    },
    {
      "lang": "es",
      "value": "Condición de carrera en Cisco IOS 12.2SCH en el módulo Performance Routing Engine (PRE) en los dispositivos uBR10000, cuando NetFlow y una VPN MPLS IPv6 están configurados, permite a atacantes remotos causar una denegación de servicio (caída del proceso PXF) mediante el envío rápido de paquetes MPLS 6VPE malformados, también conocida como Bug ID CSCud83396."
    }
  ],
  "lastModified": "2026-06-17T00:26:54.877",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2\\(33\\)sch:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4B0B3338-E4D5-4095-8974-71E53C331994"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios:12.2sch:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B4036869-5126-4C78-9F5E-3159F8FC62EB"
            }
          ],
          "operator": "OR"
        },
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:h:cisco:ubr10000_cable_modem_termination_system:-:*:*:*:*:*:*:*",
              "vulnerable": false,
              "matchCriteriaId": "AC98615A-29AC-454E-B4D9-222E8E85AD31"
            }
          ],
          "operator": "OR"
        }
      ],
      "operator": "AND"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com"
}