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Thunderbird CVE-2025-14332

HIGH
Out-of-bounds Write (CWE-787)
2025-12-09 security@mozilla.org
Memory Corruption Mozilla RCE Buffer Overflow Thunderbird Red Hat Suse
7.3
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

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

DescriptionCVE.org

Memory safety bugs present in 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 and Thunderbird 146.

AnalysisAI

Memory corruption vulnerabilities in Mozilla Firefox 145 and Thunderbird 145 enable remote code execution via multiple memory safety bugs. Unauthenticated remote attackers can exploit these flaws (CWE-787 buffer overflow) through network-based attack vectors with low complexity, requiring no user interaction. Mozilla has released patches in Firefox 146 and Thunderbird 146. EPSS score of 0.07% (21st percentile) suggests low observed exploitation probability, and no public exploit identified at time of analysis, though the vendor's assessment indicates memory corruption with exploitable potential.

Technical ContextAI

This vulnerability represents a collection of memory safety bugs affecting Mozilla's Gecko rendering engine, used by both Firefox and Thunderbird. The root cause is classified as CWE-787 (Out-of-bounds Write), a buffer overflow class where data is written beyond allocated memory boundaries. Memory safety issues in browser engines are particularly critical because they operate in highly complex environments processing untrusted data from web content, including JavaScript, HTML, CSS, and various media formats. The affected CPE strings (cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* and cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*) indicate both standalone Firefox browser and Thunderbird email client versions 145 are vulnerable. Bugzilla references (1963153, 1985058, 1995637, 1997118) suggest multiple distinct memory corruption bugs were bundled in this advisory, following Mozilla's practice of aggregating similar-severity memory safety issues into single CVEs.

RemediationAI

Vendor-released patch: Firefox 146 and Thunderbird 146. Users should immediately upgrade to Firefox version 146 or later and Thunderbird version 146 or later through the built-in update mechanism (Help → About Firefox/Thunderbird) or by downloading from mozilla.org. Both products typically feature automatic background updates enabled by default, which should deploy the fix without user intervention. Enterprise environments using managed deployment should prioritize distribution of version 146 through existing software management channels. No effective workarounds exist for memory safety vulnerabilities of this nature aside from upgrading to the patched version. Detailed remediation guidance is available in Mozilla Foundation Security Advisories MFSA2025-92 (https://www.mozilla.org/security/advisories/mfsa2025-92/) and MFSA2025-95 (https://www.mozilla.org/security/advisories/mfsa2025-95/). Organizations unable to immediately patch should consider temporarily restricting browser usage to trusted sites only until updates can be deployed.

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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
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2025-14332 vulnerability details – vuln.today
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