{"api_version":"1","generated_at":"2026-04-23T02:37:57+00:00","cve":"CVE-2021-29988","urls":{"html":"https://cve.report/CVE-2021-29988","api":"https://cve.report/api/cve/CVE-2021-29988.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-29988","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29988"},"summary":{"title":"CVE-2021-29988","description":"Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.","state":"PUBLIC","assigner":"security@mozilla.org","published_at":"2021-08-17 20:15:00","updated_at":"2022-12-09 19:15:00"},"problem_types":["CWE-125","CWE-787"],"metrics":[],"references":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-33/","name":"https://www.mozilla.org/security/advisories/mfsa2021-33/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Firefox 91 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.gentoo.org/glsa/202208-14","name":"GLSA-202208-14","refsource":"GENTOO","tags":[],"title":"Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-35/","name":"https://www.mozilla.org/security/advisories/mfsa2021-35/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Thunderbird 78.13 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-34/","name":"https://www.mozilla.org/security/advisories/mfsa2021-34/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Firefox ESR 78.13 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1717922","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1717922","refsource":"MISC","tags":[],"title":"Access Denied","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-36/","name":"https://www.mozilla.org/security/advisories/mfsa2021-36/","refsource":"MISC","tags":[],"title":"Security Vulnerabilities fixed in Thunderbird 91 — Mozilla","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.gentoo.org/glsa/202202-03","name":"GLSA-202202-03","refsource":"GENTOO","tags":[],"title":"Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo security","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29988","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29988","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"29988","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"29988","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"firefox_esr","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"29988","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"mozilla","cpe5":"thunderbird","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-29988","qid":"159356","title":"Oracle Enterprise Linux Security Update for firefox (ELSA-2021-3154)"},{"cve":"CVE-2021-29988","qid":"159357","title":"Oracle Enterprise Linux Security Update for thunderbird (ELSA-2021-3155)"},{"cve":"CVE-2021-29988","qid":"159358","title":"Oracle Enterprise Linux Security Update for firefox (ELSA-2021-3157)"},{"cve":"CVE-2021-29988","qid":"159360","title":"Oracle Enterprise Linux Security Update for thunderbird (ELSA-2021-3160)"},{"cve":"CVE-2021-29988","qid":"178754","title":"Debian Security Update for firefox-esr (DSA 4956-1)"},{"cve":"CVE-2021-29988","qid":"178757","title":"Debian Security Update for firefox-esr (DLA 2740-1)"},{"cve":"CVE-2021-29988","qid":"178762","title":"Debian Security Update for thunderbird (DSA 4959-1)"},{"cve":"CVE-2021-29988","qid":"178765","title":"Debian Security Update for thunderbird (DLA 2745-1)"},{"cve":"CVE-2021-29988","qid":"183575","title":"Debian Security Update for firefox-esrthunderbird (CVE-2021-29988)"},{"cve":"CVE-2021-29988","qid":"198457","title":"Ubuntu Security Notification for Firefox vulnerabilities (USN-5037-1)"},{"cve":"CVE-2021-29988","qid":"198479","title":"Ubuntu Security Notification for Thunderbird Vulnerabilities (USN-5058-1)"},{"cve":"CVE-2021-29988","qid":"198481","title":"Ubuntu Security Notification for Thunderbird Vulnerabilities (USN-5058-1)"},{"cve":"CVE-2021-29988","qid":"198483","title":"Ubuntu Security Notification for Thunderbird Vulnerabilities (USN-5058-1)"},{"cve":"CVE-2021-29988","qid":"239556","title":"Red Hat Update for thunderbird (RHSA-2021:3160)"},{"cve":"CVE-2021-29988","qid":"239557","title":"Red Hat Update for firefox (RHSA-2021:3159)"},{"cve":"CVE-2021-29988","qid":"239559","title":"Red Hat Update for firefox (RHSA-2021:3157)"},{"cve":"CVE-2021-29988","qid":"239560","title":"Red Hat Update for firefox (RHSA-2021:3156)"},{"cve":"CVE-2021-29988","qid":"239561","title":"Red Hat Update for thunderbird (RHSA-2021:3155)"},{"cve":"CVE-2021-29988","qid":"239562","title":"Red Hat Update for firefox (RHSA-2021:3154)"},{"cve":"CVE-2021-29988","qid":"239571","title":"Red Hat Update for thunderbird (RHSA-2021:3162)"},{"cve":"CVE-2021-29988","qid":"239572","title":"Red Hat Update for thunderbird (RHSA-2021:3161)"},{"cve":"CVE-2021-29988","qid":"257105","title":"CentOS Security Update for firefox (CESA-2021:3154)"},{"cve":"CVE-2021-29988","qid":"257106","title":"CentOS Security Update for thunderbird (CESA-2021:3160)"},{"cve":"CVE-2021-29988","qid":"352834","title":"Amazon Linux Security Advisory for thunderbird: ALAS2-2021-1709"},{"cve":"CVE-2021-29988","qid":"375753","title":"Mozilla Firefox Multiple Vulnerability (MFSA2021-33)"},{"cve":"CVE-2021-29988","qid":"375754","title":"Mozilla Firefox ESR Multiple Vulnerabilities (MFSA2021-34)"},{"cve":"CVE-2021-29988","qid":"375762","title":"Mozilla Thunderbird Multiple Vulnerabilities (MFSA2021-35)"},{"cve":"CVE-2021-29988","qid":"375767","title":"Mozilla Thunderbird Multiple Vulnerabilities (MFSA2021-36)"},{"cve":"CVE-2021-29988","qid":"501551","title":"Alpine Linux Security Update for firefox-esr"},{"cve":"CVE-2021-29988","qid":"502080","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-29988","qid":"502381","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"503632","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"503634","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"503650","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"503669","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"503851","title":"Alpine Linux Security Update for firefox"},{"cve":"CVE-2021-29988","qid":"506260","title":"Alpine Linux Security Update for thunderbird"},{"cve":"CVE-2021-29988","qid":"710574","title":"Gentoo Linux Mozilla Firefox Multiple Vulnerabilities (GLSA 202202-03)"},{"cve":"CVE-2021-29988","qid":"710585","title":"Gentoo Linux Mozilla Thunderbird Multiple Vulnerabilities (GLSA 202208-14)"},{"cve":"CVE-2021-29988","qid":"750969","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:2691-1)"},{"cve":"CVE-2021-29988","qid":"750970","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:2694-1)"},{"cve":"CVE-2021-29988","qid":"750997","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:1184-1)"},{"cve":"CVE-2021-29988","qid":"751026","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:2774-1)"},{"cve":"CVE-2021-29988","qid":"751062","title":"OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:2874-1)"},{"cve":"CVE-2021-29988","qid":"751210","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:3331-1)"},{"cve":"CVE-2021-29988","qid":"751226","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:3331-1)"},{"cve":"CVE-2021-29988","qid":"751237","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:3451-1)"},{"cve":"CVE-2021-29988","qid":"751246","title":"OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:1367-1)"},{"cve":"CVE-2021-29988","qid":"751369","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:3191-1)"},{"cve":"CVE-2021-29988","qid":"752111","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2022:1582-1)"},{"cve":"CVE-2021-29988","qid":"752113","title":"SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2022:1577-1)"},{"cve":"CVE-2021-29988","qid":"940055","title":"AlmaLinux Security Update for thunderbird (ALSA-2021:3155)"},{"cve":"CVE-2021-29988","qid":"940147","title":"AlmaLinux Security Update for firefox (ALSA-2021:3157)"},{"cve":"CVE-2021-29988","qid":"960015","title":"Rocky Linux Security Update for firefox (RLSA-2021:3157)"},{"cve":"CVE-2021-29988","qid":"960029","title":"Rocky Linux Security Update for thunderbird (RLSA-2021:3155)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-29988","ASSIGNER":"security@mozilla.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"Mozilla","product":{"product_data":[{"product_name":"Thunderbird","version":{"version_data":[{"version_value":"78.13","version_affected":"<"},{"version_value":"91","version_affected":"<"}]}},{"product_name":"Firefox ESR","version":{"version_data":[{"version_value":"78.13","version_affected":"<"}]}},{"product_name":"Firefox","version":{"version_data":[{"version_value":"91","version_affected":"<"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"Memory corruption as a result of incorrect style treatment"}]}]},"references":{"reference_data":[{"url":"https://www.mozilla.org/security/advisories/mfsa2021-33/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-33/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-35/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-35/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-34/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-34/"},{"url":"https://www.mozilla.org/security/advisories/mfsa2021-36/","refsource":"MISC","name":"https://www.mozilla.org/security/advisories/mfsa2021-36/"},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1717922","refsource":"MISC","name":"https://bugzilla.mozilla.org/show_bug.cgi?id=1717922"},{"refsource":"GENTOO","name":"GLSA-202202-03","url":"https://security.gentoo.org/glsa/202202-03"},{"refsource":"GENTOO","name":"GLSA-202208-14","url":"https://security.gentoo.org/glsa/202208-14"}]},"description":{"description_data":[{"lang":"eng","value":"Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91."}]}},"nvd":{"publishedDate":"2021-08-17 20:15:00","lastModifiedDate":"2022-12-09 19:15:00","problem_types":["CWE-125","CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"},"exploitabilityScore":2.8,"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:mozilla:thunderbird:*:*:*:*:*:*:*:*","versionEndExcluding":"78.13.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*","versionEndExcluding":"78.13.0","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*","versionEndExcluding":"91.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"29988","Ordinal":"205219","Title":"CVE-2021-29988","CVE":"CVE-2021-29988","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"29988","Ordinal":"1","NoteData":"Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"29988","Ordinal":"2","NoteData":"2021-08-17","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"29988","Ordinal":"3","NoteData":"2021-08-17","Type":"Other","Title":"Modified"}]}}}