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Thunderbird CVE-2025-11719

CRITICAL
Use After Free (CWE-416)
2025-10-14 security@mozilla.org
Memory Corruption Use After Free Buffer Overflow Mozilla Microsoft 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 - 15:44 vuln.today

DescriptionCVE.org

Starting in Thunderbird 143, the use of the native messaging API by web extensions on Windows could lead to crashes caused by use-after-free memory corruption. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

AnalysisAI

Use-after-free memory corruption in Mozilla Thunderbird 143+ and Firefox allows remote code execution via malicious web extensions exploiting the native messaging API on Windows. CVSS 9.8 (critical) with network-based attack vector requiring no user interaction or authentication. Patched in Firefox 144 and Thunderbird 144. No public exploit identified at time of analysis, but CVSS metrics indicate high exploitability (AV:N/AC:L/PR:N/UI:N) with complete impact to confidentiality, integrity, and availability.

Technical ContextAI

This vulnerability stems from CWE-416 (Use After Free), a memory safety issue where code attempts to access memory after it has been freed. The flaw resides in the native messaging API implementation used by web extensions on Windows platforms in Mozilla products. Native messaging allows web extensions to communicate with native applications outside the browser sandbox. The use-after-free occurs when extensions interact with this API, causing the browser to reference deallocated memory. This creates exploitable memory corruption that can be leveraged for arbitrary code execution. The vulnerability affects both Firefox and Thunderbird starting from version 143, indicating a shared codebase component. CPE identifiers confirm impact to cpe:2.3:a:mozilla:firefox and cpe:2.3:a:mozilla:thunderbird across all distribution channels on Windows systems.

RemediationAI

Update immediately to Firefox 144 or later and Thunderbird 144 or later to resolve this use-after-free vulnerability. Mozilla has released patches that address the memory corruption in the native messaging API implementation. Firefox users should navigate to Settings > General > Firefox Updates to check for and install version 144. Thunderbird users should check Settings > General > Updates for version 144. Organizations using managed deployments should prioritize distribution of these updates to Windows endpoints. No workarounds are available that maintain full web extension functionality, but organizations with strict security requirements could temporarily disable web extensions or restrict extension installations to trusted sources only until patching is complete. Review installed extensions and remove any untrusted or unnecessary extensions as a defense-in-depth measure. Full technical details and patch information are available in Mozilla Security Advisories MFSA2025-81 (https://www.mozilla.org/security/advisories/mfsa2025-81/) and MFSA2025-84 (https://www.mozilla.org/security/advisories/mfsa2025-84/). The upstream bug tracking this issue is documented at https://bugzilla.mozilla.org/show_bug.cgi?id=1991950.

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Same weakness CWE-416 – Use After Free

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CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
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

Same technique Memory Corruption

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2010-3333 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Critical
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-2025-11719 vulnerability details – vuln.today
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