Medium severity4.3NVD Advisory· Published Feb 23, 2021· Updated Jun 17, 2026
CVE-2021-21323
CVE-2021-21323
Description
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
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Affected products
3Patches
Vulnerability mechanics
References
5- github.com/brave/brave-browser/issues/13527nvdPatchThird Party Advisory
- github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15nvdPatchThird Party Advisory
- github.com/brave/brave-core/pull/7769nvdPatchThird Party Advisory
- github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6nvdThird Party Advisory
- hackerone.com/reports/1077022nvdPermissions RequiredThird Party Advisory
News mentions
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