CVE-2021-21323

CVSS V2 Medium 4.3 CVSS V3 Medium 5.3
Description
Brave is an open source web browser with a focus on privacy and security. In Brave versions 1.17.73-1.20.103, the CNAME adblocking feature added in Brave 1.17.73 accidentally initiated DNS requests that bypassed the Brave Tor proxy. Users with adblocking enabled would leak DNS requests from Tor windows to their DNS provider. (DNS requests that were not initiated by CNAME adblocking would go through Tor as expected.) This is fixed in Brave version 1.20.108
Overview
  • CVE ID
  • CVE-2021-21323
  • Assigner
  • security-advisories@github.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-02-23T23:15:13
  • Last Modified Date
  • 2021-03-01T16:14:07
Weakness Enumerations
CWE URL
CWE-200 http://cwe.mitre.org/data/definitions/200.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
cpe:2.3:a:brave:brave:*:*:*:*:*:*:*:* 1 OR 1.17.73 1.20.103
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:P/I:N/A:N
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • PARTIAL
  • Integrity Impact
  • NONE
  • Availability Impact
  • NONE
  • Base Score
  • 4.3
  • Severity
  • MEDIUM
  • Exploitability Score
  • 8.6
  • Impact Score
  • 2.9
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • LOW
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • LOW
  • Availability Impact
  • NONE
  • Base Score
  • 5.3
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 3.9
  • Impact Score
  • 1.4
References
Reference URL Reference Tags
https://github.com/brave/brave-browser/issues/13527 Patch Third Party Advisory
https://github.com/brave/brave-core/pull/7769 Patch Third Party Advisory
https://github.com/brave/brave-browser/security/advisories/GHSA-mqjf-9x5g-2rv6 Third Party Advisory
https://github.com/brave/brave-core/commit/12fe321eaad8acc1cbd1d70b4128f687777bcf15 Patch Third Party Advisory
https://hackerone.com/reports/1077022 Permissions Required Third Party Advisory
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-21323
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21323
History
Created Old Value New Value Data Type Notes
2022-05-10 07:21:23 Added to TrackCVE
2022-12-05 22:41:02 2021-02-23T23:15Z 2021-02-23T23:15:13 CVE Published Date updated
2022-12-05 22:41:02 2021-03-01T16:14:07 CVE Modified Date updated
2022-12-05 22:41:02 Analyzed Vulnerability Status updated