CVE-2025-6425

MEDIUM EPSS 16.1%

Published Jun 24, 20251y ago · Modified Jun 17, 20261w ago

4.3 CVSS 3.1

Medium

Published Jun 24, 2025 1y ago

Last Modified Jun 17, 2026 1w ago

Description

An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS Details

Base Score

4.3

Exploitability

2.8

Impact

1.4

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction Required

Scope Unchanged

Confidentiality Low

Integrity None

Availability None

Threat Intelligence

EPSS Exploit Probability

16.1% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure

Affected Products 3

Vendor	Product	Version	Range
mozilla	firefox	*	<115.25.0
mozilla	firefox	*	<140.0
mozilla	firefox	*	≥116.0 – <128.12.0

References 8

bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1717672

Issue TrackingVendor Advisory
lists.debian.org https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html
lists.debian.org https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html
mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-51/

Vendor Advisory
mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-52/

Vendor Advisory
mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-53/

Vendor Advisory
mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-54/

Vendor Advisory
mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-55/

Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.