CVE-2025-6432 — Sensitive Information Exposure in Mozilla Firefox

CWE-200 — Sensitive Information Exposure9 documents8 sources
Severity
8.6HIGHNVD
EPSS
0.1%
top 70.10%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedJun 24
Latest updateFeb 2

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:LExploitability: 3.9 | Impact: 4.7

Affected Packages2 packages

▶NVDmozilla/firefox< 140.0
▶Ubuntumozilla/thunderbird< 1:140.7.1+build1-0ubuntu0.22.04.1

🔴Vulnerability Details

3
GHSA
GHSA-43h2-r954-f6w6: 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↗2025-06-26
▶
OSV
CVE-2025-6432: 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↗2025-06-24
▶
CVEList
DNS Requests leaked outside of a configured SOCKS proxy↗2025-06-24
▶

📋Vendor Advisories

5
Ubuntu
Thunderbird vulnerabilities↗2026-02-02
▶
Red Hat
firefox: DNS Requests leaked outside of a configured SOCKS proxy↗2025-06-24
▶
Debian
CVE-2025-6432: firefox - When Multi-Account Containers was enabled, DNS requests could have bypassed a SO...↗2025
▶
Mozilla
Mozilla Foundation Security Advisory 2025-54: CVE-2025-6432↗
▶
Mozilla
Mozilla Foundation Security Advisory 2025-51: CVE-2025-6432↗
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CVE-2025-6432 — Sensitive Information Exposure | cvebase