CVE-2025-5270CWE-319

CVE-2025-5270

High · published May 27, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
20.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00286 · 20.0th percentile
Weakness
CWE-319 · Cleartext Transmission of Sensitive Information
Published
2025-05-27T17:15Z
Affected products (1)
ProductVersionsFixed in
mozilla/firefox< 139.0139.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=1910298 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-42/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-45/ · [email protected]
EPSS history
Timeline
  • 27 MAY 12:29Z
    SNI was sometimes unencrypted
    cvelistv5