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High severity · published Dec 27, 2021
CVE-2021-45884
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…
7.5
CVSS
3.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.2% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BR
Brave · Brave
1.17.1 through 1.33.106 · source: NVD
Affected product
BR
Brave
Brave
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45884
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-45884
Exploit
https://github.com/brave/brave-browser/issues/19070
Issue Tracking
https://github.com/brave/brave-browser/issues/20079
Patch
https://github.com/brave/brave-core/pull/10742
Permissions Required
https://hackerone.com/reports/1377864
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