{"api_version":"1","generated_at":"2026-04-25T03:01:45+00:00","cve":"CVE-2018-20340","urls":{"html":"https://cve.report/CVE-2018-20340","api":"https://cve.report/api/cve/CVE-2018-20340.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2018-20340","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-20340"},"summary":{"title":"CVE-2018-20340","description":"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.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2019-03-21 16:00:00","updated_at":"2019-12-05 17:15:00"},"problem_types":["CWE-119"],"metrics":[],"references":[{"url":"https://www.debian.org/security/2019/dsa-4389","name":"https://www.debian.org/security/2019/dsa-4389","refsource":"MISC","tags":["Third Party Advisory"],"title":"Debian -- Security Information -- DSA-4389-1 libu2f-host","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://developers.yubico.com/libu2f-host/Release_Notes.html","name":"https://developers.yubico.com/libu2f-host/Release_Notes.html","refsource":"CONFIRM","tags":["Release Notes","Vendor Advisory"],"title":"Release Notes","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://security.gentoo.org/glsa/202004-15","name":"GLSA-202004-15","refsource":"GENTOO","tags":[],"title":"libu2f-host: Multiple vulnerabilities (GLSA 202004-15) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.yubico.com/support/security-advisories/ysa-2019-01/","name":"https://www.yubico.com/support/security-advisories/ysa-2019-01/","refsource":"CONFIRM","tags":["Patch","Vendor Advisory"],"title":"Security advisory 2019-02-08 | Yubico","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://seclists.org/bugtraq/2019/Feb/23","name":"https://seclists.org/bugtraq/2019/Feb/23","refsource":"MISC","tags":["Mailing List","Third Party Advisory"],"title":"Bugtraq: [SECURITY] [DSA 4389-1] libu2f-host security update","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/","name":"https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/","refsource":"MISC","tags":[],"title":"Yubico libu2f-host vulnerability - part one | invd blog","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-20340","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20340","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2018","cve_id":"20340","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"20340","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"20340","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"yubico","cpe5":"libu2f-host","cpe6":"1.1.6","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2018","cve_id":"20340","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"yubico","cpe5":"libu2f-host","cpe6":"1.1.6","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2018-20340","qid":"750033","title":"SUSE Enterprise Linux Security Update for libu2f-host (SUSE-SU-2021:1755-1)"},{"cve":"CVE-2018-20340","qid":"750189","title":"OpenSUSE Security Update for libu2f-host (openSUSE-SU-2021:0799-1)"},{"cve":"CVE-2018-20340","qid":"750805","title":"OpenSUSE Security Update for libu2f-host (openSUSE-SU-2021:1755-1)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2018-20340","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://seclists.org/bugtraq/2019/Feb/23","refsource":"MISC","name":"https://seclists.org/bugtraq/2019/Feb/23"},{"url":"https://www.debian.org/security/2019/dsa-4389","refsource":"MISC","name":"https://www.debian.org/security/2019/dsa-4389"},{"refsource":"CONFIRM","name":"https://www.yubico.com/support/security-advisories/ysa-2019-01/","url":"https://www.yubico.com/support/security-advisories/ysa-2019-01/"},{"refsource":"CONFIRM","name":"https://developers.yubico.com/libu2f-host/Release_Notes.html","url":"https://developers.yubico.com/libu2f-host/Release_Notes.html"},{"refsource":"MISC","name":"https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/","url":"https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/"},{"refsource":"GENTOO","name":"GLSA-202004-15","url":"https://security.gentoo.org/glsa/202004-15"}]}},"nvd":{"publishedDate":"2019-03-21 16:00:00","lastModifiedDate":"2019-12-05 17:15:00","problem_types":["CWE-119"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.0","vectorString":"CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"PHYSICAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":6.8,"baseSeverity":"MEDIUM"},"exploitabilityScore":0.9,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:L/AC:L/Au:N/C:P/I:P/A:P","accessVector":"LOCAL","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":4.6},"severity":"MEDIUM","exploitabilityScore":3.9,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:yubico:libu2f-host:1.1.6:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2018","CveId":"20340","Ordinal":"140688","Title":"CVE-2018-20340","CVE":"CVE-2018-20340","Year":"2018"},"notes":[{"CveYear":"2018","CveId":"20340","Ordinal":"1","NoteData":"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.","Type":"Description","Title":null},{"CveYear":"2018","CveId":"20340","Ordinal":"2","NoteData":"2019-03-17","Type":"Other","Title":"Published"},{"CveYear":"2018","CveId":"20340","Ordinal":"3","NoteData":"2020-04-30","Type":"Other","Title":"Modified"}]}}}