{"id":"CVE-2020-13163","aliases":["GHSA-4f68-49qq-h392"],"url":"https://o3.security/vulnerability/CVE-2020-13163","summary":"Improper certificate validation in em-imap","details":"em-imap 0.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.","published":"2020-05-19T22:15:12.090Z","modified":"2026-07-08T16:28:53.568621Z","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"RubyGems","name":"em-imap","fixedVersion":null}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://github.com/ConradIrwin/em-imap/issues/25"},{"type":"EVIDENCE","url":"https://securitylab.github.com/advisories/GHSL-2020-095-conradirwin-em-imap"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T16:28:53.568621Z"}}