{"cve_id":"CVE-2009-2055","published":"2009-08-19T17:30:01.047000+00:00","last_modified":"2026-06-16T23:08:40.190000+00:00","vuln_status":"Analyzed","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.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","base_score":5.9,"base_severity":"MEDIUM","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"NONE","impact_i":"NONE","impact_a":"HIGH","cwe_ids":["CWE-20"],"in_kev":true,"kev_date_added":"2022-03-25","kev_ransomware":false,"epss_score":0.03314,"epss_percentile":0.8857,"cap_rule_version":"0.1.1","stage":"IMPACT","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"NONE","caps":["DOS"],"terminal":true,"cap_confidence":"high","ingested_at":"2026-09-18T07:52:03.801583+00:00","first_seen":"2009-08-19T17:30:01.047000+00:00","kev_first_seen":"2022-03-25T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["cisco"],"products":["ios_xr"],"affected":[{"vendor":"cisco","product":"ios_xr","ranges":["3.4","3.4.0","3.4.1","3.4.2","3.4.3","3.5","3.5.2","3.5.3","3.5.4","3.6.0","3.6.1","3.6.2","3.6.3","3.7.0","3.7.1","3.7.2","3.7.3","3.8.0","3.8.1"]}]}