CVE-2025-6432

HIGH

Firefox < 140.0 - DNS Proxy Bypass via Invalid Domain or Unresponsive SOCKS Proxy

Title source: llm
STIX 2.1

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 was fixed in Firefox 140 and Thunderbird 140.

References (3)

Core 3

Scores

CVSS v3 8.6
EPSS 0.0041
EPSS Percentile 61.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (3)
mozilla/firefox < 140.0
Mozilla/Firefox 140
Mozilla/Thunderbird 140
Published Jun 24, 2025
Tracked Since Feb 18, 2026