CVE Vulnerability

CVE-2021-21323

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

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

5.3 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/brave/brave-browser/issues/13527 Patch Third Party Advisory
https://github.com/brave/brave-core/pull/7769 Patch Third Party Advisory
https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6 Third Party Advisory
https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15 Patch Third Party Advisory
https://hackerone.com/reports/1077022 Permissions Required Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:brave:brave:*:*:*:*:*:*:*:*
Information

Published : 2021-02-23 11:15

Updated : 2021-03-01 04:14

NVD link : CVE-2021-21323

Mitre link : CVE-2021-21323

Products Affected
No products.
CWE
CWE-200