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4.3
CVSSv2

CVE-2021-21323

Published: 23/02/2021 Updated: 01/03/2021
CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6
CVSS v3 Base Score: 5.3 | Impact Score: 1.4 | Exploitability Score: 3.9
VMScore: 383
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
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Vulnerability Summary

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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References

CWE-200https://github.com/brave/brave-browser/issues/13527https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15https://github.com/brave/brave-core/pull/7769https://hackerone.com/reports/1077022https://nvd.nist.gov
CVSSv2
CVSSv2
CVSSv3
VMScore
Recommendations:
CVE-2022-48693CVE-2024-30851CVE-2024-34460CVE-2024-2887localCVE-2024-27956remote code executionCVE-2024-34475privilege
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