{"id":"CVE-2021-45884","aliases":["EUVD-2021-32600","GHSA-7q5w-r799-frgq"],"status":"published","title":"In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying...","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.0315,"percentile":0.88105,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200"],"published":"2021-12-27T21:31:48Z","modified":"2026-06-17T04:14:11Z","products":[{"vendor":"brave","product":"brave"}],"references":[{"url":"https://github.com/brave/brave-core/pull/10742","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/brave/brave-browser/issues/19070","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/brave/brave-browser/issues/20079","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Release Notes","Third Party Advisory","report"]},{"url":"https://hackerone.com/reports/1377864","tags":["x_refsource_MISC","x_transferred","Permissions Required","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-45884"},{"url":"https://github.com/advisories/GHSA-7q5w-r799-frgq"}],"sources":{"cve":[{"id":"CVE-2021-45884","description":"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.","status":"published","published":"2021-12-27T21:31:48Z","modified":"2024-08-04T04:54:30.857Z","updated_at":"2026-11-02T14:33:02.20241Z"}],"euvd":[{"id":"EUVD-2021-32600","description":"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.","status":"published","published":"2021-12-27T21:31:48Z","modified":"2024-08-04T04:54:30Z","updated_at":"2026-11-03T03:08:25.77408Z"}],"ghsa":[{"id":"GHSA-7q5w-r799-frgq","title":"In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying...","description":"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.","status":"published","published":"2021-12-28T00:00:23Z","modified":"2023-02-03T05:03:46Z","cwes":["CWE-200"],"updated_at":"2026-11-02T14:53:25.279029Z"}],"nvd":[{"id":"CVE-2021-45884","description":"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.","status":"published","published":"2021-12-27T22:15:07.847Z","modified":"2026-06-17T04:14:11.41Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:07:02.977492Z"}],"osv":[{"id":"CVE-2021-45884","description":"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.","status":"published","published":"2021-12-27T22:15:07.847Z","modified":"2026-04-10T04:41:43.04016Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:22.18434Z"}]}}