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Thunderbird CVE-2025-14324

CRITICAL
Code Injection (CWE-94)
2025-12-09 security@mozilla.org
Mozilla RCE Code Injection Thunderbird Red Hat Suse
9.8
CVSS 3.1 · NVD
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Severity by source

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
7.5 HIGH
qualitative

Primary rating from NVD.

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 - 16:10 vuln.today

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

AnalysisAI

JIT compiler miscompilation in Mozilla's JavaScript engine allows remote code execution without authentication in Firefox (versions <146, <115.31 ESR, <140.6 ESR) and Thunderbird (versions <146, <140.6 ESR). The CVSS 9.8 critical score reflects network-based exploitation requiring no user interaction. EPSS score of 0.10% (27th percentile) suggests low predicted exploitation probability despite severity. No public exploit identified at time of analysis, and vendor-released patches are available across all affected product lines per Mozilla security advisories MFSA2025-92 through MFSA2025-96.

Technical ContextAI

This vulnerability resides in the Just-In-Time (JIT) compiler component of Mozilla's SpiderMonkey JavaScript engine, which dynamically optimizes JavaScript code execution at runtime. JIT compilers translate interpreted JavaScript into native machine code for performance gains, but improper optimization can lead to miscompilation where the generated code behaves differently than intended. The CWE-94 classification (Code Injection) indicates the flaw allows attacker-controlled data to be executed as code. The affected CPE strings identify Mozilla Firefox (standard and ESR channels) and Thunderbird (standard and ESR), with JIT compilation occurring during normal JavaScript processing in web pages or email content. The bug references Bugzilla issue #1996840, suggesting Mozilla's internal discovery and tracking prior to public disclosure.

RemediationAI

Immediately upgrade to patched versions: Firefox 146 or later, Firefox ESR 115.31 or later, Firefox ESR 140.6 or later, Thunderbird 146 or later, or Thunderbird ESR 140.6 or later as specified in Mozilla Security Advisories at https://www.mozilla.org/security/advisories/mfsa2025-92/ through MFSA2025-96. For enterprise environments unable to immediately deploy updates, implement temporary risk reduction by disabling JavaScript execution in Thunderbird (Preferences > Privacy & Security > disable JavaScript in mail), though this significantly impacts HTML email rendering. Firefox has no practical JavaScript-disable workaround for general web browsing. For Firefox ESR deployments, prioritize upgrading from the 115.x track to 115.31 or migrating to the 140.6 ESR track per organizational support policies. Verify successful patching by navigating to About Firefox or About Thunderbird and confirming version numbers meet or exceed the fixed releases. Organizations using centralized update management should prioritize deployment given the network-based attack vector affecting user-facing applications.

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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-2025-14324 vulnerability details – vuln.today
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