CVE-2021-45884
CVSS v3
7.5
HIGH
EPSS Score
3.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2021-12-27
Frequently asked questions
What is 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 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.
Is CVE-2021-45884 actively exploited?
Active exploitation of CVE-2021-45884 has not been confirmed. Its EPSS score was 3.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-45884?
CVE-2021-45884 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-45884 affecting your environment?
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