Network Protocol Bypass Vulnerability in Mozilla Firefox
CVE-2025-6432

8.6HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
24 June 2025

What is CVE-2025-6432?

A vulnerability exists in Mozilla Firefox where enabling Multi-Account Containers could lead to DNS requests that bypass a SOCKS proxy if the domain name is invalid or the proxy is unresponsive. This issue can expose users to enhanced risks by circumventing expected network security protocols in versions of Firefox below 140.

Affected Version(s)

Firefox < 140

Thunderbird < 140

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1943804
https://www.mozilla.org/security/advisories/mfsa2025-51/
https://www.mozilla.org/security/advisories/mfsa2025-54/

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Albert
.