CVE-2021-21323

{"containers": {"cna": {"affected": [{"product": "brave-browser", "vendor": "brave", "versions": [{"status": "affected", "version": ">= 1.17.73, < 1.20.108"}]}], "descriptions": [{"lang": "en", "value": "Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108"}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-02-23T22:45:19.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-browser/issues/13527"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-core/pull/7769"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15"}, {"tags": ["x_refsource_MISC"], "url": "https://hackerone.com/reports/1077022"}], "source": {"advisory": "GHSA-mqjf-9x5g-2rv6", "discovery": "UNKNOWN"}, "title": "Regression in DNS leakage from Tor windows", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-21323", "STATE": "PUBLIC", "TITLE": "Regression in DNS leakage from Tor windows"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "brave-browser", "version": {"version_data": [{"version_value": ">= 1.17.73, < 1.20.108"}]}}]}, "vendor_name": "brave"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108"}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor"}]}]}, "references": {"reference_data": [{"name": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6", "refsource": "CONFIRM", "url": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6"}, {"name": "https://github.com/brave/brave-browser/issues/13527", "refsource": "MISC", "url": "https://github.com/brave/brave-browser/issues/13527"}, {"name": "https://github.com/brave/brave-core/pull/7769", "refsource": "MISC", "url": "https://github.com/brave/brave-core/pull/7769"}, {"name": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15", "refsource": "MISC", "url": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15"}, {"name": "https://hackerone.com/reports/1077022", "refsource": "MISC", "url": "https://hackerone.com/reports/1077022"}]}, "source": {"advisory": "GHSA-mqjf-9x5g-2rv6", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T18:09:15.370Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-browser/issues/13527"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-core/pull/7769"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://hackerone.com/reports/1077022"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-21323", "datePublished": "2021-02-23T22:45:19.000Z", "dateReserved": "2020-12-22T00:00:00.000Z", "dateUpdated": "2024-08-03T18:09:15.370Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "brave-browser", "vendor": "brave", "versions": [{"status": "affected", "version": ">= 1.17.73, < 1.20.108"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:brave:brave:*:*:*:*:*:*:*:*", "matchCriteriaId": "AD17A757-9D61-4E54-849D-AD603B5001F3", "versionEndIncluding": "1.20.103", "versionStartIncluding": "1.17.73", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108"}, {"lang": "es", "value": "Brave es un navegador web de c\u00f3digo abierto que se centra en la privacidad y la seguridad.&#xa0;En Brave versiones 1.17.73-1.20.103, la funcionalidad CNAME adblocking agregada en Brave versi\u00f3n 1.17.73, inici\u00f3 accidentalmente peticiones de DNS que omitieron el proxy Brave Tor.&#xa0;Los usuarios con adblocking habilitado filtrar\u00edan las peticiones DNS de las ventanas Tor a su proveedor de DNS.&#xa0;(Las peticiones DNS que no fueron iniciadas por el CNAME adblocking pasar\u00edan por Tor como se esperaba). Esto se corrigi\u00f3 en Brave versi\u00f3n 1.20.108"}], "id": "CVE-2021-21323", "lastModified": "2026-06-17T03:35:17.803", "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": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-02-23T23:15:13.317", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/13527"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15"}, {"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/pull/7769"}, {"source": "security-advisories@github.com", "tags": ["Permissions Required", "Third Party Advisory"], "url": "https://hackerone.com/reports/1077022"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-browser/issues/13527"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/brave/brave-core/pull/7769"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Permissions Required", "Third Party Advisory"], "url": "https://hackerone.com/reports/1077022"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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