CVE-2021-43538

{"containers": {"cna": {"affected": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "91.4.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"lessThan": "91.4.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThan": "95", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. 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{"affected": [{"affectedData": [{"product": "Thunderbird", "vendor": "Mozilla", "versions": [{"lessThan": "91.4.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox ESR", "vendor": "Mozilla", "versions": [{"lessThan": "91.4.0", "status": "affected", "version": "unspecified", "versionType": "custom"}]}, {"product": "Firefox", "vendor": "Mozilla", "versions": [{"lessThan": "95", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@mozilla.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*", "matchCriteriaId": "83D69E34-EB94-49ED-9FA1-F68400971726", "versionEndExcluding": "95.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*", "matchCriteriaId": "F90A171C-1670-4EBA-9DE0-E31E8F3CD0FA", "versionEndExcluding": "91.4.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*", "matchCriteriaId": "6F0BE95D-5BE5-49F7-92BA-CF3A3920D447", "versionEndExcluding": "91.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}, {"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95."}, {"lang": "es", "value": "Mediante el uso indebido de una carrera en nuestro c\u00f3digo de notificaci\u00f3n, un atacante podr\u00eda haber ocultado a la fuerza la notificaci\u00f3n de las p\u00e1ginas que hab\u00edan recibido acceso a pantalla completa y bloqueo de puntero, lo que podr\u00eda haber sido usado para ataques de suplantaci\u00f3n de identidad. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 91.4.0, Firefox ESR versiones anteriores a 91.4.0 y Firefox versiones anteriores a 95"}], "id": "CVE-2021-43538", "lastModified": "2026-06-17T04:11:05.583", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-08T22:15:09.677", "references": [{"source": "security@mozilla.org", "tags": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1739091"}, {"source": "security@mozilla.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html"}, {"source": "security@mozilla.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202202-03"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-14"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-5026"}, {"source": "security@mozilla.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2022/dsa-5034"}, {"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": ["Issue Tracking", "Permissions Required", "Vendor Advisory"], "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1739091"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202202-03"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.gentoo.org/glsa/202208-14"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2021/dsa-5026"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2022/dsa-5034"}, {"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-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"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: Missing fullscreen and pointer lock notification when requesting both", "id": "2030109", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2030109"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-1021", "details": ["By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.", "The Mozilla Foundation Security Advisory describes this flaw as:\nBy misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks."], "name": "CVE-2021-43538", "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-2021-43538\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-43538"], "threat_severity": "Important"}

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