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Firefox EUVDEUVD-2025-19101

| CVE-2025-6425 MEDIUM
Information Exposure (CWE-200)
2025-06-24 security@mozilla.org
Information Disclosure Mozilla
4.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Network attack vector, low complexity, no privileges, user interaction required, low confidentiality impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Ubuntu
MEDIUM
qualitative
SUSE
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 22:36 euvd
EUVD-2025-19101
Analysis Generated
Mar 15, 2026 - 22:36 vuln.today
CVE Published
Jun 24, 2025 - 13:15 nvd
MEDIUM 4.3

DescriptionCVE.org

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 affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.

AnalysisAI

Information disclosure in Mozilla Firefox and Thunderbird allows an attacker who enumerated resources from the WebCompat extension to obtain a persistent UUID that identifies the browser, persisting across containers and normal/private browsing modes but not profiles. This affects Firefox < 140, Firefox ESR < 115.25 and < 128.12, Thunderbird < 140 and < 128.12. No public exploit identified at time of analysis; EPSS score is low (0.09%).

Technical ContextAI

The vulnerability resides in the WebCompat extension, a built-in component in Firefox and Thunderbird that helps maintain compatibility with websites. The extension exposes a persistent UUID that can be enumerated by an attacker, leading to information disclosure (CWE-200). The UUID remains consistent across different browsing contexts (containers, private mode) but changes between browser profiles. The attack requires user interaction (UI:R) as the attacker must convince the user to visit a malicious page or interact with a crafted resource.

RemediationAI

Update to Firefox 140, Firefox ESR 115.25 or 128.12, Thunderbird 140 or 128.12, or later versions. Patches are available from Mozilla. For Linux distributions, apply updates via USN-7663-1 (Ubuntu), DSA-5950-1 (Debian), or RHSA-2025:10073 (Red Hat). No workarounds are documented; upgrading is the recommended action.

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Same weakness CWE-200 – Information Exposure

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9.8
CVE-2017-16894 HIGH POC
7.5
CVE-2017-11165 CRITICAL POC
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CVE-2020-3259 HIGH
7.5

Same technique Information Disclosure

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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

Ubuntu

Priority: Medium
firefox
Release Status Version
jammy not-affected code not present
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
upstream needs-triage -
questing not-affected code not present
thunderbird
Release Status Version
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
upstream released 128.12
jammy released 1:128.12.0+build1-0ubuntu0.22.04.1
questing not-affected code not present
mozjs38
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs52
Release Status Version
bionic ignored -
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs68
Release Status Version
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs78
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs91
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs102
Release Status Version
jammy ignored -
noble ignored -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs115
Release Status Version
jammy DNE -
noble ignored -
oracular ignored -
plucky ignored -
upstream needs-triage -
questing DNE -
USN-7663-1

Debian

firefox
Release Status Fixed Version Urgency
sid fixed 148.0.2-1 -
(unstable) fixed 140.0-1 -
firefox-esr
Release Status Fixed Version Urgency
bullseye fixed 128.12.0esr-1~deb11u1 -
bullseye (security) fixed 140.8.0esr-1~deb11u1 -
bookworm fixed 128.12.0esr-1~deb12u1 -
bookworm (security) fixed 140.8.0esr-1~deb12u1 -
trixie (security), trixie fixed 140.8.0esr-1~deb13u1 -
forky, sid fixed 140.8.0esr-1 -
(unstable) fixed 128.12.0esr-1 -
thunderbird
Release Status Fixed Version Urgency
bullseye fixed 1:128.12.0esr-1~deb11u1 -
bullseye (security) fixed 1:140.8.0esr-1~deb11u1 -
bookworm fixed 1:128.12.0esr-1~deb12u1 -
bookworm (security) fixed 1:140.8.0esr-1~deb12u1 -
trixie (security), trixie fixed 1:140.8.0esr-1~deb13u1 -
forky, sid fixed 1:140.8.0esr-1 -
(unstable) fixed 1:128.12.0esr-1 -
DLA-4231-1 DLA-4239-1 DSA-5950-1 DSA-5959-1

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-4.11 Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected

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EUVD-2025-19101 vulnerability details – vuln.today
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