CVE-2025-5270

7.5 HIGH

Published: May 27, 2025 Modified: April 13, 2026

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

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

Source: security@mozilla.org

Permissions Required

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

Source: security@mozilla.org

Vendor Advisory

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

Source: security@mozilla.org

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

7.5 / 10.0

EPSS (Exploit Probability)

0.2%

38th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-319

Affected Vendors

mozilla

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