{"action":"Upgrade exim4 to 4.90.1-1 or later.","affected":[{"fixed":"4.90.1-1","introduced":"0"}],"component":"exim4","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["4.90.1-1"],"id":"tcs_01M5NDGAN0NBYZ4KFNXTPZHT1H","modified_at":"2026-10-23T18:03:08.103530019Z","published_at":"2018-02-08T23:29:01.170Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2018-6789","https://security-tracker.debian.org/tracker/CVE-2018-6789"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2018-6789","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2018-6789"}],"summary":"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."}