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Thunderbird CVE-2025-14330

CRITICAL
Buffer Overflow (CWE-119)
2025-12-09 security@mozilla.org
Mozilla Buffer Overflow Thunderbird Red Hat Suse
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
SUSE
CRITICAL
qualitative
Red Hat
6.1 MEDIUM
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

1
Analysis Generated
Apr 13, 2026 - 16:11 vuln.today

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

AnalysisAI

Just-In-Time (JIT) compilation flaws in Mozilla's JavaScript engine allow unauthenticated remote attackers to achieve arbitrary code execution with high integrity and availability impact across Firefox and Thunderbird. Affects Firefox <146, Firefox ESR <140.6, Thunderbird <146, and Thunderbird ESR <140.6. Despite a critical CVSS 9.8 score, EPSS probability remains low at 0.09% (25th percentile), and no public exploit or active exploitation (CISA KEV) has been identified at time of analysis. Vendor-released patches are available across all affected product lines.

Technical ContextAI

This vulnerability stems from a JIT compiler miscompilation in Mozilla's SpiderMonkey JavaScript engine, classified as CWE-119 (Improper Restriction of Operations within Memory Buffer Bounds). JIT compilers optimize JavaScript execution by translating bytecode to native machine code at runtime. Miscompilation errors can result in type confusion, incorrect bounds checking, or improper memory operations in the generated code. The affected CPE strings identify four product configurations: Firefox standard release (cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*), Firefox Extended Support Release (cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*), Thunderbird standard (cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*), and Thunderbird ESR (cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*). Buffer overflow conditions in JIT-compiled code can enable attackers to corrupt memory, manipulate execution flow, and bypass security sandboxes inherent to browser and email client architectures.

RemediationAI

Vendor-released patches are available for all affected products. Upgrade Firefox standard release to version 146 or later, and Firefox ESR installations to version 140.6 or later. Upgrade Thunderbird standard release to version 146 or later, and Thunderbird ESR to version 140.6 or later. Organizations should deploy these updates through existing patch management workflows prioritizing internet-facing systems and high-value user populations. Mozilla provides detailed security advisories at https://www.mozilla.org/security/advisories/mfsa2025-92/ (Firefox 146), https://www.mozilla.org/security/advisories/mfsa2025-94/ (Firefox ESR 140.6), https://www.mozilla.org/security/advisories/mfsa2025-95/ (Thunderbird 146), and https://www.mozilla.org/security/advisories/mfsa2025-96/ (Thunderbird ESR 140.6). No workarounds are documented; patching is the sole remediation path. Technical details remain limited in public Bugzilla entry https://bugzilla.mozilla.org/show_bug.cgi?id=1997503 to prevent exploit development. Enterprise deployments using managed browser update systems should verify successful version deployment post-patch.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
Container suse/sl-micro/6.0/toolbox:latest Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.2 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd 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 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 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
SUSE Enterprise Storage 7.1 Fixed

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CVE-2025-14330 vulnerability details – vuln.today
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