Use-After-Free Memory Corruption in Firefox and Thunderbird
CVE-2025-11719

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Thunderbird
Vendor
CVE Published:
14 October 2025

What is CVE-2025-11719?

In Firefox and Thunderbird, versions prior to 144, a vulnerability exists within the native messaging API utilized by web extensions on Windows. This flaw can result in crashes due to use-after-free memory corruption, potentially impacting user experience and system stability. Users are advised to upgrade to the latest versions to mitigate the risk associated with this issue.

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Affected Version(s)

Firefox < 144

Thunderbird < 144

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1991950
https://www.mozilla.org/security/advisories/mfsa2025-81/
https://www.mozilla.org/security/advisories/mfsa2025-84/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Filip Ĺ tamcar
JSON
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