CVE-2025-6432: Mozilla Firefox

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mozilla Firefox: before 140.0 (fixed in 140.0)

Published 2025-06-24. Last modified 2026-09-30.