CVE-2025-5270

HIGH
2025-05-27 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Patch Released
Apr 06, 2026 - 14:30 nvd
Patch available
Analysis Generated
Mar 28, 2026 - 18:44 vuln.today
CVE Published
May 27, 2025 - 13:15 nvd
HIGH 7.5

Tags

Information Disclosure Mozilla Firefox Thunderbird Redhat Suse

Description

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

Analysis

In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified under CWE-319. In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139 and Thunderbird < 139. Affected products include: Mozilla Firefox.

Affected Products

Mozilla Firefox.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.2
CVSS: +38
POC: 0

Vendor Status

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CVE-2025-5270 vulnerability details – vuln.today
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