{"cve_id":"CVE-2018-6789","published":"2018-02-08T23:29:01.170000+00:00","last_modified":"2026-06-17T02:02:17.180000+00:00","vuln_status":"Analyzed","description":"An issue was discovered in the base64d function in the SMTP listener in Exim before 4.90.1. By sending a handcrafted message, a buffer overflow may happen. This can be used to execute code remotely.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-120"],"in_kev":true,"kev_date_added":"2021-11-03","kev_ransomware":true,"epss_score":0.82137,"epss_percentile":0.99655,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T08:42:37.921061+00:00","first_seen":"2018-02-08T23:29:01.170000+00:00","kev_first_seen":"2021-11-03T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["canonical","debian","exim"],"products":["debian_linux","exim","ubuntu_linux"],"affected":[{"vendor":"canonical","product":"ubuntu_linux","ranges":["17.10","14.04","16.04"]},{"vendor":"debian","product":"debian_linux","ranges":["9.0","7.0","8.0"]},{"vendor":"exim","product":"exim","ranges":["< 4.90.1"]}]}