When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-21376 When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140 and Thunderbird < 140.
Ubuntu USN Ubuntu USN USN-7991-1 Thunderbird vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 13 Apr 2026 15:00:00 +0000

Type Values Removed Values Added
Description When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140 and Thunderbird < 140. When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

Thu, 30 Oct 2025 16:30:00 +0000

Type Values Removed Values Added
Title firefox: DNS Requests leaked outside of a configured SOCKS proxy DNS Requests leaked outside of a configured SOCKS proxy

Tue, 15 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00058}

epss

{'score': 0.00055}


Mon, 14 Jul 2025 18:45:00 +0000

Type Values Removed Values Added
Description When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140. When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140 and Thunderbird < 140.
References

Thu, 03 Jul 2025 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Vendors & Products Mozilla
Mozilla firefox

Thu, 26 Jun 2025 00:30:00 +0000

Type Values Removed Values Added
Title firefox: DNS Requests leaked outside of a configured SOCKS proxy
References
Metrics threat_severity

None

threat_severity

Low


Wed, 25 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 24 Jun 2025 12:45:00 +0000

Type Values Removed Values Added
Description When Multi-Account Containers was enabled, DNS requests could have bypassed a SOCKS proxy when the domain name was invalid or the SOCKS proxy was not responding. This vulnerability affects Firefox < 140.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-04-13T14:31:07.825Z

Reserved: 2025-06-20T14:51:37.854Z

Link: CVE-2025-6432

cve-icon Vulnrichment

Updated: 2025-06-25T14:20:33.868Z

cve-icon NVD

Status : Modified

Published: 2025-06-24T13:15:24.220

Modified: 2026-04-13T15:17:07.637

Link: CVE-2025-6432

cve-icon Redhat

Severity : Low

Publid Date: 2025-06-24T12:28:03Z

Links: CVE-2025-6432 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-06T22:16:27Z

Weaknesses