{"id":"CVE-2009-2055","aliases":["EUVD-2009-2051","GHSA-2j56-f322-jxrm"],"status":"published","title":"Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session...","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.","severity":{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.03314,"percentile":0.88651,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2009-08-19T17:00:00Z","modified":"2026-06-16T23:08:40Z","kev":{"date_added":"2022-03-25","due_date":"2022-04-15","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2022-03-25"},{"source":"kev","since":"2022-03-25"}],"products":[{"vendor":"cisco","product":"ios xr"},{"vendor":"cisco","product":"ios_xr"}],"references":[{"url":"http://mailman.nanog.org/pipermail/nanog/2009-August/012719.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List"]},{"url":"http://securitytracker.com/id?1022739","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","Broken Link"]},{"url":"http://www.cisco.com/en/US/products/products_security_advisory09186a0080af150f.shtml","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-2055","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-2055"},{"url":"https://github.com/advisories/GHSA-2j56-f322-jxrm"}],"sources":{"cve":[{"id":"CVE-2009-2055","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":"published","published":"2009-08-19T17:00:00Z","modified":"2026-01-12T20:39:47.917Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:33:23.395558Z"}],"euvd":[{"id":"EUVD-2009-2051","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":"published","published":"2009-08-19T17:00:00Z","modified":"2026-01-12T20:39:47Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"exploited_since":"2022-03-25","updated_at":"2026-11-02T19:48:53.22038Z"}],"ghsa":[{"id":"GHSA-2j56-f322-jxrm","title":"Cisco IOS XR 3.4.0 through 3.8.1 allows remote attackers to cause a denial of service (session...","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":"published","published":"2022-05-02T03:31:14Z","modified":"2026-01-12T21:31:31Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:05:34.043335Z"}],"kev":[{"id":"CVE-2009-2055","title":"Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service Vulnerability","description":"Cisco IOS XR,when BGP is the configured routing feature, allows remote attackers to cause a denial-of-service (DoS).","cwes":["CWE-20"],"kev":{"date_added":"2022-03-25","due_date":"2022-04-15","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:16.541131Z"}],"nvd":[{"id":"CVE-2009-2055","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":"published","published":"2009-08-19T17:30:01.047Z","modified":"2026-06-16T23:08:40.19Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:01:36.596719Z"}]}}