{"api_version":"1","generated_at":"2026-07-23T12:18:36+00:00","cve":"CVE-2021-3405","urls":{"html":"https://cve.report/CVE-2021-3405","api":"https://cve.report/api/cve/CVE-2021-3405.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3405","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3405"},"summary":{"title":"CVE-2021-3405","description":"A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.","state":"PUBLIC","assigner":"secalert@redhat.com","published_at":"2021-02-23 20:15:00","updated_at":"2023-11-07 03:37:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YY7R2JZRO5I6WS62KTJFTZGKYELVFTVB/","name":"FEDORA-2021-9a0fff8455","refsource":"","tags":[],"title":"[SECURITY] Fedora 32 Update: libebml-1.4.2-1.fc32 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YY7R2JZRO5I6WS62KTJFTZGKYELVFTVB/","name":"FEDORA-2021-9a0fff8455","refsource":"FEDORA","tags":["Mailing List","Third Party Advisory"],"title":"[SECURITY] Fedora 32 Update: libebml-1.4.2-1.fc32 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JNHQI6MDOECJ2HT5GCLEX2DMJFEOWPW7/","name":"FEDORA-2021-aa78f97893","refsource":"FEDORA","tags":["Mailing List","Third Party Advisory"],"title":"[SECURITY] Fedora 33 Update: libebml-1.4.2-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.gentoo.org/glsa/202208-21","name":"GLSA-202208-21","refsource":"GENTOO","tags":[],"title":"libebml: Heap buffer overflow vulnerability (GLSA 202208-21) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/Matroska-Org/libebml/issues/74","name":"https://github.com/Matroska-Org/libebml/issues/74","refsource":"MISC","tags":["Exploit","Issue Tracking","Third Party Advisory"],"title":"Ebml[Unicode]String::ReadData heap overflow bug on 32bit builds · Issue #74 · Matroska-Org/libebml · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UHIIMWZKHHELFF4NRDMOOCS3HKK3K4DF/","name":"FEDORA-2021-e283997bb9","refsource":"","tags":[],"title":"[SECURITY] Fedora 34 Update: libebml-1.4.2-1.fc34 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNHQI6MDOECJ2HT5GCLEX2DMJFEOWPW7/","name":"FEDORA-2021-aa78f97893","refsource":"","tags":[],"title":"[SECURITY] Fedora 33 Update: libebml-1.4.2-1.fc33 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.debian.org/debian-lts-announce/2021/04/msg00016.html","name":"[debian-lts-announce] 20210418 [SECURITY] [DLA 2629-1] libebml security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 2629-1] libebml security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UHIIMWZKHHELFF4NRDMOOCS3HKK3K4DF/","name":"FEDORA-2021-e283997bb9","refsource":"FEDORA","tags":[],"title":"[SECURITY] Fedora 34 Update: libebml-1.4.2-1.fc34 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3405","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3405","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"3405","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":"2021","cve_id":"3405","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"32","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3405","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":"3405","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"34","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3405","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"32","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3405","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":"3405","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"matroska","cpe5":"libebml","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3405","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"matroska","cpe5":"libebml","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-3405","qid":"178535","title":"Debian Security Update for libebml (DLA 2629-1)"},{"cve":"CVE-2021-3405","qid":"180233","title":"Debian Security Update for libebml (CVE-2021-3405)"},{"cve":"CVE-2021-3405","qid":"281572","title":"Fedora Security Update for libebml (FEDORA-2021-e283997bb9)"},{"cve":"CVE-2021-3405","qid":"281573","title":"Fedora Security Update for libebml (FEDORA-2021-aa78f97893)"},{"cve":"CVE-2021-3405","qid":"281574","title":"Fedora Security Update for libebml (FEDORA-2021-9a0fff8455)"},{"cve":"CVE-2021-3405","qid":"501597","title":"Alpine Linux Security Update for libebml"},{"cve":"CVE-2021-3405","qid":"710596","title":"Gentoo Linux libebml Heap buffer overflow Vulnerability (GLSA 202208-21)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-3405","ASSIGNER":"secalert@redhat.com","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"libebml","version":{"version_data":[{"version_value":"before 1.4.2"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-787"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://github.com/Matroska-Org/libebml/issues/74","url":"https://github.com/Matroska-Org/libebml/issues/74"},{"refsource":"FEDORA","name":"FEDORA-2021-9a0fff8455","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/YY7R2JZRO5I6WS62KTJFTZGKYELVFTVB/"},{"refsource":"FEDORA","name":"FEDORA-2021-aa78f97893","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JNHQI6MDOECJ2HT5GCLEX2DMJFEOWPW7/"},{"refsource":"FEDORA","name":"FEDORA-2021-e283997bb9","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UHIIMWZKHHELFF4NRDMOOCS3HKK3K4DF/"},{"refsource":"MLIST","name":"[debian-lts-announce] 20210418 [SECURITY] [DLA 2629-1] libebml security update","url":"https://lists.debian.org/debian-lts-announce/2021/04/msg00016.html"},{"refsource":"GENTOO","name":"GLSA-202208-21","url":"https://security.gentoo.org/glsa/202208-21"}]},"description":{"description_data":[{"lang":"eng","value":"A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml."}]}},"nvd":{"publishedDate":"2021-02-23 20:15:00","lastModifiedDate":"2023-11-07 03:37:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"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:matroska:libebml:*:*:*:*:*:*:*:*","versionEndExcluding":"1.4.2","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","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":"2021","CveId":"3405","Ordinal":"202021","Title":"CVE-2021-3405","CVE":"CVE-2021-3405","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"3405","Ordinal":"1","NoteData":"A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"3405","Ordinal":"2","NoteData":"2021-02-23","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"3405","Ordinal":"3","NoteData":"2021-04-18","Type":"Other","Title":"Modified"}]}}}