{
  "id": "CVE-2009-2055",
  "url": "https://spydr.io/cve/CVE-2009-2055",
  "published": "2009-08-19T17:30:01.047Z",
  "modified": "2026-06-16T23:08:40.190Z",
  "score": 5.9,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "score_source": "CISA ADP",
  "epss": 0.03314,
  "epss_percentile": 0.88225,
  "exploited": true,
  "kev": {
    "added": "2022-03-25",
    "due": "2022-04-15",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2009-2055"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "cisco"
  ],
  "products": [
    "cisco ios xr"
  ],
  "cwes": [
    "CWE-20"
  ],
  "description": "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.",
  "status": "Analyzed",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 5.9,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://securitytracker.com/id?1022739",
      "tags": [
        "Broken Link"
      ]
    },
    {
      "url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2009-2055",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}