CVE-2025-5270: In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139.
7.5
CVSS
Description
In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139.
Classification
CVE ID: CVE-2025-5270
CVSS Base Severity: HIGH
CVSS Base Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Problem Types
SNI was sometimes unencryptedAffected Products
Vendor: Mozilla
Product: Firefox
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.02% (probability of being exploited)
EPSS Percentile: 2.95% (scored less or equal to compared to others)
EPSS Date: 2025-06-08 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-5270https://bugzilla.mozilla.org/show_bug.cgi?id=1910298
https://www.mozilla.org/security/advisories/mfsa2025-42/