CVE-2021-45884

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying extension with a SOCKS fallback are enabled, additional DNS requests are issued outside of the proxying extension using the system's DNS settings, resulting in information disclosure. NOTE: this issue exists because of an incomplete fix for CVE-2021-21323 and CVE-2021-22916."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-12-27T21:31:48.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-core/pull/10742"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-browser/issues/19070"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-browser/issues/20079"}, {"tags": ["x_refsource_MISC"], "url": "https://hackerone.com/reports/1377864"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-45884", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying extension with a SOCKS fallback are enabled, additional DNS requests are issued outside of the proxying extension using the system's DNS settings, resulting in information disclosure. NOTE: this issue exists because of an incomplete fix for CVE-2021-21323 and CVE-2021-22916."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://github.com/brave/brave-core/pull/10742", "refsource": "MISC", "url": "https://github.com/brave/brave-core/pull/10742"}, {"name": "https://github.com/brave/brave-browser/issues/19070", "refsource": "MISC", "url": "https://github.com/brave/brave-browser/issues/19070"}, {"name": "https://github.com/brave/brave-browser/issues/20079", "refsource": "MISC", "url": "https://github.com/brave/brave-browser/issues/20079"}, {"name": "https://hackerone.com/reports/1377864", "refsource": "MISC", "url": "https://hackerone.com/reports/1377864"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T04:54:30.857Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-core/pull/10742"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-browser/issues/19070"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-browser/issues/20079"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://hackerone.com/reports/1377864"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-45884", "datePublished": "2021-12-27T21:31:48.000Z", "dateReserved": "2021-12-27T00:00:00.000Z", "dateUpdated": "2024-08-04T04:54:30.857Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:brave:brave:*:*:*:*:*:*:*:*", "matchCriteriaId": "8D18AD5E-AE64-4719-82F2-6A5ED9C913C8", "versionEndIncluding": "1.33.106", "versionStartIncluding": "1.17.1", "vulnerable": true}], "negate": false, "operator": "OR"}, {"cpeMatch": [{"criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E", "vulnerable": false}, {"criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1", "vulnerable": false}, {"criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying extension with a SOCKS fallback are enabled, additional DNS requests are issued outside of the proxying extension using the system's DNS settings, resulting in information disclosure. NOTE: this issue exists because of an incomplete fix for CVE-2021-21323 and CVE-2021-22916."}, {"lang": "es", "value": "En Brave Desktop versiones 1.17 hasta 1.33 anteriores a 1.33.106, cuando es habilitado el bloqueo de anuncios basado en CNAME y una extensi\u00f3n de proxy con una reserva SOCKS, se emiten peticiones DNS adicionales fuera de la extensi\u00f3n de proxy usando la configuraci\u00f3n DNS del sistema, resultando en una divulgaci\u00f3n de informaci\u00f3n. NOTA: este problema se presenta debido a una correcci\u00f3n incompleta de CVE-2021-21323 y CVE-2021-22916"}], "id": "CVE-2021-45884", "lastModified": "2026-06-17T04:14:11.410", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-12-27T22:15:07.847", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/19070"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking", "Release Notes", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/20079"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/pull/10742"}, {"source": "cve@mitre.org", "tags": ["Permissions Required"], "url": "https://hackerone.com/reports/1377864"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/19070"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Release Notes", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/20079"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/pull/10742"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Permissions Required"], "url": "https://hackerone.com/reports/1377864"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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