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Thunderbird CVE-2025-14333

HIGH
Out-of-bounds Write (CWE-787)
2025-12-09 security@mozilla.org
Memory Corruption Mozilla RCE Buffer Overflow Thunderbird Red Hat Suse
8.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
Apr 13, 2026 - 16:12 vuln.today

DescriptionCVE.org

Memory safety bugs present in Firefox ESR 140.5, Thunderbird ESR 140.5, Firefox 145 and Thunderbird 145. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

AnalysisAI

Multiple memory corruption flaws in Firefox and Thunderbird enable remote code execution via network-accessible attack vectors. Mozilla Firefox ESR 140.5, Firefox 145, Thunderbird ESR 140.5, and Thunderbird 145 contain memory safety bugs with evidence of corruption that Mozilla presumes exploitable for arbitrary code execution. Authentication requirements not confirmed from available data (CVSS vector shows PR:N). Vendor-released patches available: Firefox 146, Firefox ESR 140.6, Thunderbird 146, Thunderbird 140.6. EPSS probability is low (0.09%, 25th percentile), and no public exploit identified at time of analysis.

Technical ContextAI

This vulnerability represents a class of memory safety issues rooted in CWE-787 (Out-of-bounds Write), commonly manifesting as buffer overflows or heap corruption in browser rendering engines and JavaScript parsers. The affected products - Mozilla Firefox (both standard and Extended Support Release channels) and Thunderbird email client - share the Gecko rendering engine and SpiderMonkey JavaScript engine. CPE data confirms impact across Firefox versions up to 145 (standard) and 140.5 (ESR), plus corresponding Thunderbird versions. Memory corruption vulnerabilities in browser engines are particularly critical because they execute in the context of rendered web content, allowing attackers to escape sandboxing mechanisms or gain code execution by crafting malicious HTML, CSS, or JavaScript. The presence of multiple distinct bugs (Bugzilla IDs 1966501, 1997639) suggests systemic memory management issues rather than a single isolated defect.

RemediationAI

Upgrade immediately to patched versions: Firefox 146 or later (standard channel), Firefox ESR 140.6 or later (extended support), Thunderbird 146 or later (standard), or Thunderbird ESR 140.6 or later (extended support). Mozilla has released fixes across all affected product lines as documented in security advisories at https://www.mozilla.org/security/advisories/mfsa2025-92/, https://www.mozilla.org/security/advisories/mfsa2025-94/, https://www.mozilla.org/security/advisories/mfsa2025-95/, and https://www.mozilla.org/security/advisories/mfsa2025-96/. Consumer installations with automatic updates enabled will receive patches without user intervention. Enterprise environments using ESR channels should deploy version 140.6 through standard software distribution mechanisms. No effective workarounds exist for memory corruption vulnerabilities; patching is the only reliable mitigation. Verify successful update by navigating to About Firefox/Thunderbird in application menus.

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Same weakness CWE-787 – Out-of-bounds Write

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Same technique Memory Corruption

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Vendor StatusVendor

SUSE

Severity: High
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-2025-14333 vulnerability details – vuln.today
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