CVE-2021-22917: Brave Browser Desktop between versions 1.17 and 1.20 is vulnerable to information disclosure by way of DNS req

Q: How do I fix CVE-2021-22917?

browser: upgrade to 1.20. Exact commands for each OS are on this page.

Q: Is CVE-2021-22917 being exploited?

CVE-2021-22917 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-22917 affect?

CVE-2021-22917 affects browser. Severity is medium (CVSS 6.5). Brave Browser Desktop between versions 1.17 and 1.20 is vulnerable to information disclosure by way of DNS requests in Tor windows not flowing through Tor if adblocking was enabled.

Q: How urgent is CVE-2021-22917?

Priority 40/100. No elevated risk signals yet.

This month

MEDIUM 6.5UPGRADE

CVE-2021-22917 is a medium-severity flaw (CVSS 6.5) affecting browser. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Brave Browser Desktop between versions 1.17 and 1.20 is vulnerable to information disclosure by way of DNS requests in Tor windows not flowing through Tor if adblocking was enabled.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-200
Published	2021-07-12
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: brave

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-07-12 11:15 UTCPublished CVE record published
2026-06-17 03:38 UTCUpdated Record last modified

brave browser UPGRADE

Affected: > 1.17 and < 1.20

Fixed in: 1.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy browser || rpm -q browser || browser --version

2. UPGRADE to 1.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade browser

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade browser

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-22917?

browser: upgrade to 1.20. Exact commands for each OS are on this page.

Is CVE-2021-22917 being exploited?

CVE-2021-22917 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-22917 affect?

CVE-2021-22917 affects browser. Severity is medium (CVSS 6.5). Brave Browser Desktop between versions 1.17 and 1.20 is vulnerable to information disclosure by way of DNS requests in Tor windows not flowing through Tor if adblocking was enabled.

How urgent is CVE-2021-22917?

Priority 40/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities

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CVE-2023-28364 MEDIUM 6.1 UPGRADE An Open Redirect vulnerability exists prior to version 1.52.117, where the built-in QR scanner in Brave Browse
CVE-2017-18016 MEDIUM 5.3 DOWNGRADE Parity Browser 1.6.10 and earlier allows remote attackers to bypass the Same Origin Policy and obtain sensitiv
CVE-2017-1000461 MEDIUM 4.7 UPGRADE Brave Software's Brave Browser, version 0.19.73 (and earlier) is vulnerable to an incorrect access control iss

References

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