CVE-2021-4129

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Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0."}, {"lang": "es", "value": "Los desarrolladores de Mozilla y miembros de la comunidad Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler y Masayuki Nakano informaron sobre errores de seguridad de la memoria presentes en Firefox 94. Algunos de estos errores mostraron evidencia de corrupci\u00f3n de la memoria y suponemos que con suficiente esfuerzo algunos de estos podr\u00edan haber sido explotados para ejecutar c\u00f3digo arbitrario. Esta vulnerabilidad afecta a Firefox &lt; 95, Firefox ESR &lt; 91.4.0 y Thunderbird &lt; 91.4.0."}], "id": "CVE-2021-4129", "lastModified": "2026-06-17T04:19:05.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-4129", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-16T15:56:25.351498Z", "version": "2.0.3"}}]}, "published": "2022-12-22T20:15:12.133", "references": [{"source": "security@mozilla.org", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C1737009%2C1739372%2C1739421"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-52/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-53/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-54/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/buglist.cgi?bug_id=1393362%2C1736046%2C1736751%2C1737009%2C1739372%2C1739421"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-52/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-53/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2021-54/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2021:5014", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:91.4.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-12-08T00:00:00Z"}, {"advisory": "RHSA-2021:5046", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:91.4.0-3.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:5013", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:91.4.0-1.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-12-08T00:00:00Z"}, {"advisory": "RHSA-2021:5045", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:91.4.0-2.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:5017", "cpe": "cpe:/a:redhat:rhel_e4s:8.1", "package": "firefox-0:91.4.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2021-12-08T00:00:00Z"}, {"advisory": "RHSA-2021:5055", "cpe": "cpe:/a:redhat:rhel_e4s:8.1", "package": "thunderbird-0:91.4.0-2.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:5016", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:91.4.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-12-08T00:00:00Z"}, {"advisory": "RHSA-2021:5047", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:91.4.0-2.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-12-09T00:00:00Z"}, {"advisory": "RHSA-2021:5015", "cpe": "cpe:/a:redhat:rhel_eus:8.4", "package": "firefox-0:91.4.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2021-12-08T00:00:00Z"}, {"advisory": "RHSA-2021:5048", "cpe": "cpe:/a:redhat:rhel_eus:8.4", "package": "thunderbird-0:91.4.0-2.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2021-12-09T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4", "id": "2030116", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2030116"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-120", "details": ["Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.", "The Mozilla Foundation Security Advisory describes this flaw as:\nMozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Thunderbird 91.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code."], "name": "CVE-2021-4129", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}], "public_date": "2021-12-07T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-4129\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-4129\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2021-53/#CVE-2021-4129\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-4129"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

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