CVE-2025-11719 — CRITICAL (9.8)

Q: How severe is CVE-2025-11719?

CVE-2025-11719 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2025-11719?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird, Microsoft Windows.

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

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

Affected Products

Vendor	Product	Versions
Mozilla	Firefox	>= 143.0, < 144.0
Mozilla	Thunderbird	>= 143.0, < 144.0
Microsoft	Windows	-

Related Weaknesses (CWE)

CWE-416

References

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

FAQ

What is CVE-2025-11719?

CVE-2025-11719 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...

How severe is CVE-2025-11719?

CVE-2025-11719 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-11719?

Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Thunderbird, Microsoft Windows.