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Mozilla CVE-2025-6424

| EUVDEUVD-2025-19086 CRITICAL
Use After Free (CWE-416)
2025-06-24 security@mozilla.org
Use After Free Mozilla Denial Of Service Memory Corruption
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
qualitative
SUSE
CRITICAL
qualitative
Red Hat
7.5 HIGH
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 22:36 euvd
EUVD-2025-19086
Analysis Generated
Mar 15, 2026 - 22:36 vuln.today
CVE Published
Jun 24, 2025 - 13:15 nvd
CRITICAL 9.8

DescriptionCVE.org

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability affects Firefox < 140, Firefox ESR < 115.25, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.

AnalysisAI

A denial of service vulnerability (CVSS 9.8). Critical severity with potential for significant impact on affected systems.

Technical ContextAI

CWE-416 (Use After Free). CVSS 9.8 indicates critical severity with likely remote exploitation vector.

RemediationAI

Monitor vendor channels for patch availability.

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Same weakness CWE-416 – Use After Free

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8.8
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7.8
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9.8
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CVE-2013-2551 HIGH POC
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Same technique Use After Free

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CVE-2012-4792 HIGH POC
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CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

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
jammy released 1:128.12.0+build1-0ubuntu0.22.04.1
upstream released 128.12
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: Critical
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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CVE-2025-6424 vulnerability details – vuln.today
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