CVE-2021-45884

Public Exploit

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.32%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/brave/brave-core/pull/10742 third party advisory patch
https://github.com/brave/brave-browser/issues/19070 issue tracking patch exploit third party advisory
https://github.com/brave/brave-browser/issues/20079 issue tracking release notes third party advisory
https://hackerone.com/reports/1377864 permissions required

Frequently Asked Questions

What is the severity of CVE-2021-45884?
CVE-2021-45884 has been scored as a high severity vulnerability.
How to fix CVE-2021-45884?
To fix CVE-2021-45884, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-45884 being actively exploited in the wild?
It is possible that CVE-2021-45884 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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