CVE-2025-6432 DNS Requests leaked outside of a configured SOCKS proxy

What is CVE-2025-6432?

CVE-2025-6432 is a high-severity vulnerability in Mozilla Firefox, published on 24 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-200

Which versions are affected by CVE-2025-6432?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2025-6432?

Upgrade to a fixed version.

Is CVE-2025-6432 being exploited?

There is no known exploitation of CVE-2025-6432 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-43h2-r954-f6w6, UBUNTU-CVE-2025-6432.