Vulnerability · NVD

CVE-2025-5270

CVE-2025-5270, high severity (CVSS 7.5): 1 tracked app concerned, all fixed or indeterminable on their current version.

Severity (CVSS): 7.5
Exploitation: 0.3 %
Tracked apps: 1
Still exposed: 0

Published on 2025-05-27

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.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

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

EPSS 0.29% exploit very unlikely percentile 21.6%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Firefox Windows winget:Mozilla.Firefox

Affected <139.0 Fixed in 139.0 Latest tracked 160.0 patched

Observed affected builds (120)

138.0.4 138.0.3 138.0.1 138.0 137.0.2 137.0.1 137.0 136.0.4 136.0.3 136.0.2 136.0.1 136.0 135.0.1 135.0 134.0.2 134.0.1 134.0 133.0.3 133.0 132.0.2 132.0.1 132.0 131.0.3 131.0.2 131.0 130.0.1 130.0 129.0.2 129.0.1 129.0 +90 · see history

Vulnerable CPE configurations (1)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	firefox All platforms (wildcard)	All platforms (wildcard)	<139.0	cpe:2.3:a:mozilla:firefox::::::::

View on NVD ↗ Advisory · www.mozilla.org

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