CVE-2025-5270

high

Description

In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

References

https://www.mozilla.org/security/advisories/mfsa2025-45/

https://www.mozilla.org/security/advisories/mfsa2025-42/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-18106

https://bugzilla.mozilla.org/show_bug.cgi?id=1910298

Details

Source: Mitre, NVD

Published: 2025-05-27

Updated: 2026-09-30

Named Vulnerability: GHSA-hf6r-227w-qwf9

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N