CVE-2009-2055

Estado: AnalizadaMedia (5.9)⚠ Explotación activa

Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.9

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 3.31%
Percentil entre todas las CVEs puntuadas: 88
Fecha de la puntuación: 6/10/2026

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).

CISA KEV — explotada activamente

Añadida al catálogo: 25/3/2022
Plazo de remediación: 15/4/2022
Uso conocido en ransomware: Unknown

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %

Vulnerabilidad en Cisco IOS XR explotable remotamente (AV:N) mediante mensaje BGP UPDATE con atributo inválido que causa DoS por reinicio de sesión, sin requerir privilegios previos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

Cisco — IOS XR

CWE

CWE-20
CWE-20

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2009-2055",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2009-2055",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-11-08T17:41:43.520580Z"
        }
      }
    ],
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "psirt@cisco.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2009-08-19T17:30:01.047",
  "references": [
    {
      "url": "http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html",
      "tags": [
        "Mailing List"
      ],
      "source": "psirt@cisco.com"
    },
    {
      "url": "http://securitytracker.com/id?1022739",
      "tags": [
        "Broken Link"
      ],
      "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://mailman.nanog.org/pipermail/nanog/2009-August/012719.html",
      "tags": [
        "Mailing List"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securitytracker.com/id?1022739",
      "tags": [
        "Broken Link"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session reset) via a BGP UPDATE message with an invalid attribute, as demonstrated in the wild on 17 August 2009."
    },
    {
      "lang": "es",
      "value": "Cisco IOS XR desde la v3.4.0 hasta la v3.8.1 permite a atacantes remotos producir una denegación de servicio (reset de sesión) a través de el mensaje BGP UPDATE con un atributo invalido, como se demostró el 17 de Agosto de 2009."
    }
  ],
  "lastModified": "2026-06-16T23:08:40.190",
  "cisaActionDue": "2022-04-15",
  "cisaExploitAdd": "2022-03-25",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "75538529-611A-43B5-AC4D-089C4E2E2ACC"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "00DA2581-F618-4F2A-AB65-DA23DF51AF89"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.4.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "81797938-F953-42BE-B287-AA48B9860AF6"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.4.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "92AED038-C73F-4499-B064-F01D80DB0C64"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.4.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CB7A249B-AF69-47D0-B6DE-968B4CD0BA42"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F992D03D-1DB8-44C1-B59D-1C09A32A2C91"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.5.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C5F15240-6323-4766-801A-D887F3EA8A6B"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.5.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D99DC1CF-78DC-4E59-98BA-DD84702D6467"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.5.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0B9FA754-E3D2-4D80-8F4B-41139973D9FC"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.6.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F497A05C-2FC5-427D-8036-2476ACA956C0"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.6.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2252E7B0-9112-4E9E-8CF4-4EC53C630CFD"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.6.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1131A524-AA7A-4C94-9FFE-54546EA7D2CC"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.6.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "46D1A634-D39C-4305-8915-4AA289FB68EE"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.7.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "21BAB799-3150-46D8-AEA3-9FCC73203221"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.7.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "99042285-94AC-4C57-8EAA-EE63C678A94A"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.7.2:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2E752AA9-CC1C-44B6-A916-A3C76A57F05C"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.7.3:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "71CBE50E-9BD3-4F74-8C7A-BE4905090EE2"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.8.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "96F48419-AF66-4B50-ACBF-9E38287A64FA"
            },
            {
              "criteria": "cpe:2.3:o:cisco:ios_xr:3.8.1:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EBB71A24-AA6C-4BAD-BD37-5C191751C9DF"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability"
}