{"cve":"CVE-2020-13163","nvd":{"published":"2020-05-19T22:15:12.090","modified":"2026-06-17T02:52:43.250","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-295"],"references":["https://github.com/ConradIrwin/em-imap/issues/25","https://securitylab.github.com/advisories/GHSL-2020-095-conradirwin-em-imap","https://github.com/ConradIrwin/em-imap/issues/25","https://securitylab.github.com/advisories/GHSL-2020-095-conradirwin-em-imap"],"products":["em-imap_project:em-imap"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-13163","score":0.0077,"percentile":0.55639,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-4f68-49qq-h392","url":"https://osv.dev/vulnerability/GHSA-4f68-49qq-h392","summary":"Improper certificate validation in em-imap","modified":"2024-02-16T08:24:55.783264Z","packages":[{"ecosystem":"RubyGems","name":"em-imap","purl":"pkg:gem/em-imap","ranges":["<=0.5"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}