{"api_version":"1","generated_at":"2026-04-23T08:13:46+00:00","cve":"CVE-2021-3404","urls":{"html":"https://cve.report/CVE-2021-3404","api":"https://cve.report/api/cve/CVE-2021-3404.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3404","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3404"},"summary":{"title":"CVE-2021-3404","description":"In ytnef 1.9.3, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and potentially code execution) due to a heap buffer overflow which can be triggered via a crafted file.","state":"PUBLIC","assigner":"secalert@redhat.com","published_at":"2021-03-04 22:15:00","updated_at":"2022-04-25 20:25:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1926965","name":"https://bugzilla.redhat.com/show_bug.cgi?id=1926965","refsource":"MISC","tags":["Issue Tracking","Third Party Advisory"],"title":"1926965 – (CVE-2021-3404) CVE-2021-3404 ytnef: heap-based buffer overflow in SwapWord function in lib/ytnef.c via crafted file","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/Yeraze/ytnef/issues/86","name":"https://github.com/Yeraze/ytnef/issues/86","refsource":"MISC","tags":["Exploit","Issue Tracking","Third Party Advisory"],"title":"Heap buffer overflow via TNEFVersion · Issue #86 · Yeraze/ytnef · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3404","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3404","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"33","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"redhat","cpe5":"enterprise_linux","cpe6":"7.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"redhat","cpe5":"enterprise_linux","cpe6":"7.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ytnef_project","cpe5":"ytnef","cpe6":"1.9.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3404","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ytnef_project","cpe5":"ytnef","cpe6":"1.9.3","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-3404","qid":"180246","title":"Debian Security Update for libytnef (CVE-2021-3404)"},{"cve":"CVE-2021-3404","qid":"501725","title":"Alpine Linux Security Update for ytnef"}]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2021-3404","ASSIGNER":"secalert@redhat.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"In ytnef 1.9.3, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and potentially code execution) due to a heap buffer overflow which can be triggered via a crafted file."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-119","cweId":"CWE-119"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"ytnef","version":{"version_data":[{"version_affected":"=","version_value":"All versions"}]}}]}}]}},"references":{"reference_data":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1926965","refsource":"MISC","name":"https://bugzilla.redhat.com/show_bug.cgi?id=1926965"},{"url":"https://github.com/Yeraze/ytnef/issues/86","refsource":"MISC","name":"https://github.com/Yeraze/ytnef/issues/86"}]}},"nvd":{"publishedDate":"2021-03-04 22:15:00","lastModifiedDate":"2022-04-25 20:25:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL","baseScore":6.8},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:ytnef_project:ytnef:1.9.3:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"3404","Ordinal":"202019","Title":"CVE-2021-3404","CVE":"CVE-2021-3404","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"3404","Ordinal":"1","NoteData":"In ytnef 1.9.3, the SwapWord function in lib/ytnef.c allows remote attackers to cause a denial-of-service (and potentially code execution) due to a heap buffer overflow which can be triggered via a crafted file.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"3404","Ordinal":"2","NoteData":"2021-03-04","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"3404","Ordinal":"3","NoteData":"2021-03-04","Type":"Other","Title":"Modified"}]}}}