CVE-2009-2056

Estado: ModificadaBaja (3.3)—
Cisco IOS XR 3.8.1 and earlier allows remote authenticated users to cause a denial of service (process crash) via vectors involving a BGP UPDATE message with many AS numbers prepended to the AS path.
CVSS

Versión: 2.0
Vector: AV:N/AC:L/Au:M/C:N/I:N/A:P
Puntuación base: 3.3
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 1.34%
Percentil entre todas las CVEs puntuadas: 70
Fecha de la puntuación: 7/10/2026
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 XR
CWE

CWE-264
Referencias

JSON original (NVD)

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{
  "id": "CVE-2009-2056",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 3.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:M/C:N/I:N/A:P",
          "authentication": "MULTIPLE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 6.4,
        "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": "2009-08-21T17:30:00.297",
  "references": [
    {
      "url": "http://securitytracker.com/id?1022756",
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://securitytracker.com/id?1022756",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-264"
        }
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    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cisco IOS XR 3.8.1 and earlier allows remote authenticated users to cause a denial of service (process crash) via vectors involving a BGP UPDATE message with many AS numbers prepended to the AS path."
    },
    {
      "lang": "es",
      "value": "Cisco IOS XR 3.8.1 y versiones anteriores permite a atacantes remotos autenticados provocar una denegación de servicio (caida de proceso) mediante vectores relacionados con un mensaje BGP UPDATE con muchos números AS al comienzo de la ruta AS."
    }
  ],
  "lastModified": "2026-06-16T23:08:40.357",
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}