{"id":"CVE-2018-20340","details":"Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.","modified":"2026-03-15T22:19:51.161746Z","published":"2019-03-21T16:00:35.983Z","related":["SUSE-SU-2019:1340-1","SUSE-SU-2019:1749-1","SUSE-SU-2021:1755-1","openSUSE-SU-2019:1475-1","openSUSE-SU-2021:0799-1","openSUSE-SU-2021:1755-1"],"references":[{"type":"ADVISORY","url":"https://www.debian.org/security/2019/dsa-4389"},{"type":"ADVISORY","url":"https://developers.yubico.com/libu2f-host/Release_Notes.html"},{"type":"ADVISORY","url":"https://seclists.org/bugtraq/2019/Feb/23"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202004-15"},{"type":"FIX","url":"https://www.yubico.com/support/security-advisories/ysa-2019-01/"},{"type":"ARTICLE","url":"https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"1.1.6"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20340.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}