{"id":"CVE-2018-6789","aliases":[],"url":"https://o3.security/vulnerability/CVE-2018-6789","summary":null,"details":"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.","published":"2018-02-08T23:29:01.170Z","modified":"2026-10-20T13:45:09.158947841Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.82137,"percentile":0.99633,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":14,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-6789"},{"type":"ADVISORY","url":"http://openwall.com/lists/oss-security/2018/02/10/2"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2018/02/07/2"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/103049"},{"type":"ADVISORY","url":"http://www.securitytracker.com/id/1040461"},{"type":"ADVISORY","url":"https://exim.org/static/doc/security/CVE-2018-6789.txt"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2018/02/msg00009.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/3565-1/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2018/dsa-4110"},{"type":"FIX","url":"https://git.exim.org/exim.git/commit/cf3cd306062a08969c41a1cdd32c6855f1abecf1"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/162959/Exim-base64d-Buffer-Overflow.html"},{"type":"EVIDENCE","url":"https://devco.re/blog/2018/03/06/exim-off-by-one-RCE-exploiting-CVE-2018-6789-en/"},{"type":"EVIDENCE","url":"https://www.exploit-db.com/exploits/44571/"},{"type":"EVIDENCE","url":"https://www.exploit-db.com/exploits/45671/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T13:45:09.158947841Z"}}