CVE-2021-4140

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{"affected": [{"affectedData": [{"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"lessThan": "91.5", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThan": "96", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "91.5", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "473CF696-0664-4239-995D-D4700507DD1A", "versionEndExcluding": "96.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "A8FD4DD9-9B65-49B3-9FED-6FF5085489D2", "versionEndExcluding": "91.5", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "A1A101E0-2173-4299-8F05-F325DCDC804B", "versionEndExcluding": "91.5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5."}, {"lang": "es", "value": "Fue posible construir un marcado XSLT espec\u00edfico que podr\u00eda omitir un entorno limitado de iframe. Esta vulnerabilidad afecta a Firefox ESR &lt; 91.5, Firefox &lt; 96 y Thunderbird &lt; 91.5."}], "id": "CVE-2021-4140", "lastModified": "2026-06-17T04:19:06.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "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-2021-4140", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-04-16T15:55:14.536299Z", "version": "2.0.3"}}]}, "published": "2022-12-22T20:15:12.250", "references": [{"source": "security@mozilla.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1746720"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-01/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-02/"}, {"source": "security@mozilla.org", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-03/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1746720"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-01/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-02/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.mozilla.org/security/advisories/mfsa2022-03/"}], "sourceIdentifier": "security@mozilla.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-91"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-91"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2022:0124", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "firefox-0:91.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0127", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "thunderbird-0:91.5.0-1.el7_9", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0129", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "thunderbird-0:91.5.0-1.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0130", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "firefox-0:91.5.0-1.el8_5", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0125", "cpe": "cpe:/a:redhat:rhel_e4s:8.1", "package": "firefox-0:91.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0131", "cpe": "cpe:/a:redhat:rhel_e4s:8.1", "package": "thunderbird-0:91.5.0-1.el8_1", "product_name": "Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0123", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "thunderbird-0:91.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0132", "cpe": "cpe:/a:redhat:rhel_eus:8.2", "package": "firefox-0:91.5.0-1.el8_2", "product_name": "Red Hat Enterprise Linux 8.2 Extended Update Support", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0126", "cpe": "cpe:/a:redhat:rhel_eus:8.4", "package": "firefox-0:91.5.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-01-12T00:00:00Z"}, {"advisory": "RHSA-2022:0128", "cpe": "cpe:/a:redhat:rhel_eus:8.4", "package": "thunderbird-0:91.5.0-1.el8_4", "product_name": "Red Hat Enterprise Linux 8.4 Extended Update Support", "release_date": "2022-01-12T00:00:00Z"}], "bugzilla": {"description": "Mozilla: Iframe sandbox bypass with XSLT", "id": "2039568", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2039568"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-1021", "details": ["It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.", "The Mozilla Foundation Security Advisory describes this flaw as:\nIt was possible to construct specific XSLT markups that would enable someone to bypass an iframe sandbox."], "name": "CVE-2021-4140", "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": "2022-01-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-4140\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-4140\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2022-02/#CVE-2021-4140\nhttps://www.mozilla.org/en-US/security/advisories/mfsa2022-03/#CVE-2021-4140"], "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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