How severe is CVE-2021-22916?

CVE-2021-22916 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-22916 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22916?

CVE-2021-22916 affects Brave. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-22916?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-22916 published?

CVE-2021-22916 was published on 2021-07-12 and last updated on 2026-06-17.

CVE-2021-22916

CVE-2021-22916 is a medium-severity vulnerability in Brave with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Brave
Published: 2021-07-12
Last modified: 2026-06-17

Description

In Brave Desktop between versions 1.17 and 1.26.60, when adblocking is enabled and a proxy browser extension is installed, the CNAME adblocking feature issues DNS requests that used the system DNS settings instead of the extension's proxy settings, resulting in possible information disclosure.

Frequently asked questions

What is CVE-2021-22916?: In Brave Desktop between versions 1.17 and 1.26.60, when adblocking is enabled and a proxy browser extension is installed, the CNAME adblocking feature issues DNS requests that used the system DNS settings instead of the extension's proxy settings, resulting in possible information disclosure.
How severe is CVE-2021-22916?: CVE-2021-22916 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-22916 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22916?: CVE-2021-22916 affects Brave. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-22916?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-22916 published?: CVE-2021-22916 was published on 2021-07-12 and last updated on 2026-06-17.

References

https://hackerone.com/reports/1203842

Affected products (1)

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

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