CVE-2021-21323CWE-200

Regression in DNS leakage from Tor windows

Medium · published February 23, 2021

CVSS v3.1
4.3
EPSS
2%
Percentile
82.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.02260 · 82.8th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2021-02-23T22:45Z
EPSS history
Timeline
  • 23 FEB 22:45Z
    Regression in DNS leakage from Tor windows
    cvelistv5