{"id":"CVE-2021-3547","details":"OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.","modified":"2026-07-08T05:57:48.190913381Z","published":"2021-07-12T11:15:08.233Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"3.6"},{"last_affected":"3.6"}],"source":"CPE_STRING","vendor_product":"openvpn:openvpn","cpes":["cpe:2.3:a:openvpn:openvpn:3.6:*:*:*:*:*:*:*"]}]},"references":[{"type":"ADVISORY","url":"https://community.openvpn.net/openvpn/wiki/SecurityAnnouncements"},{"type":"FIX","url":"https://community.openvpn.net/openvpn/wiki/CVE-2021-3547"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openvpn/openvpn3","events":[{"introduced":"1e6208e102ea6781710401d71fffe017658dcedf"},{"last_affected":"861fe85afb66bc593ec4ae138fd42b1553b892ad"}],"database_specific":{"cpe":["cpe:2.3:a:openvpn:openvpn:3.6:*:*:*:*:*:*:*","cpe:2.3:a:openvpn:openvpn:3.6.1:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"3.6"},{"last_affected":"3.6"},{"introduced":"3.6.1"},{"last_affected":"3.6.1"}],"source":"CPE_STRING"}}],"versions":["3.6","3.6.1","release/3.6.1","release/3.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3547.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}