CVE-2021-43529

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{"affected": [{"affectedData": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "91.3.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "65E19CA9-5FDF-4253-8D56-FD82239F7D93", "versionEndExcluding": "91.3.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures."}, {"lang": "es", "value": "Las versiones de Thunderbird anteriores a la 91.3.0 son vulnerables al desbordamiento del almacenamiento din\u00e1mico descrito en CVE-2021-43527 al procesar mensajes S/MIME. Las versiones 91.3.0 y posteriores de Thunderbird no llamar\u00e1n al c\u00f3digo vulnerable al procesar mensajes S/MIME que contengan certificados con firmas DSA o RSA-PSS codificadas en DER."}], "id": "CVE-2021-43529", "lastModified": "2026-06-17T04:11:04.513", "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-2021-43529", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-03-19T15:00:26.576004Z", "version": "2.0.3"}}]}, "published": "2023-02-16T22:15:10.810", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-43529"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-43529"}], "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-2021:4134", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:91.3.0-2.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2021-11-04T00:00:00Z"}, {"advisory": "RHSA-2021:4130", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:91.3.0-2.el8_4", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2021-11-04T00:00:00Z"}, {"advisory": "RHSA-2021:4133", "cpe": "cpe:/a:redhat:rhel_eus:8.1", "package": "thunderbird-0:91.3.0-2.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Extended Update Support", "release_date": "2021-11-04T00:00:00Z"}, {"advisory": "RHSA-2021:4132", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:91.3.0-2.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2021-11-04T00:00:00Z"}], "bugzilla": {"description": "thunderbird: Memory corruption when processing S/MIME messages", "id": "2088353", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2088353"}, "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": ["Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.", "A flaw was found in Thunderbird, which is vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures."], "name": "CVE-2021-43529", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2021-12-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-43529\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-43529\nhttps://access.redhat.com/security/cve/CVE-2021-43527\nhttps://access.redhat.com/security/vulnerabilities/RHSB-2021-008\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=1738501"], "statement": "Thunderbird is affected when parsing email with the S/MIME signature. Thunderbird on Red Hat Enterprise Linux 8.4 and later does not need to be updated since it uses the system NSS library, but earlier Red Hat Enterprise Linux 8 extended lifestreams will need to update Thunderbird as well as NSS.", "threat_severity": "Critical"}

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