CVE-2025-5270 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Mozilla	Firefox

Configuration 1 [-]

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

No data.

References

Link	Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=1910298
https://nvd.nist.gov/vuln/detail/CVE-2025-5270
https://www.cve.org/CVERecord?id=CVE-2025-5270
https://www.mozilla.org/security/advisories/mfsa2025-42/

History

Wed, 28 May 2025 19:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Mozilla Mozilla firefox
CPEs		cpe:2.3:a:mozilla:firefox::::::::
Vendors & Products		Mozilla Mozilla firefox

Wed, 28 May 2025 14:45:00 +0000

Type	Values Removed	Values Added
Title		firefox: SNI was sometimes unencrypted
References		https://nvd.nist.gov/vuln/detail/CVE-2025-5270 https://www.cve.org/CVERecord?id=CVE-2025-5270
Metrics	threat_severity `None`	threat_severity `Low`

Tue, 27 May 2025 18:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-319
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 27 May 2025 12:45:00 +0000

Type	Values Removed	Values Added
Description		In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139.
References		https://bugzilla.mozilla.org/show_bug.cgi?id=1910298 https://www.mozilla.org/security/advisories/mfsa2025-42/

MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2025-05-27T12:29:28.612Z

Updated: 2025-05-27T17:40:41.837Z

Reserved: 2025-05-27T12:29:28.241Z

Link: CVE-2025-5270

Vulnrichment

Updated: 2025-05-27T17:40:36.778Z

NVD

Status : Analyzed

Published: 2025-05-27T13:15:22.823

Modified: 2025-05-28T18:36:10.270

Link: CVE-2025-5270

Redhat

Severity : Low

Publid Date: 2025-05-27T12:29:28Z

Links: CVE-2025-5270 - Bugzilla

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