CVE-2025-11719

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 v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
mozilla	firefox	143.0 — 144.0
mozilla	thunderbird	143.0 — 144.0
microsoft	windows	All

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-81/ https://www.mozilla.org/security/advisories/mfsa2025-84/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1991950

Frequently Asked Questions

What is CVE-2025-11719? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-11719? +

CVE-2025-11719 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-11719? +

CVE-2025-11719 affects products from microsoft, mozilla, specifically: firefox, thunderbird, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-11719? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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