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CVE-2025-11719

Mozilla Firefox use-after-free

9.8 CRITICALEPSS 0.35%
  1. Published14 Oct 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mozilla Firefox≥ 143.0 < 144.0
Mozilla Thunderbird≥ 143.0 < 144.0

Remediation

Fixed in
Mozilla Firefox≥ 144.0
Mozilla Thunderbird≥ 144.0

References

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Frequently asked

Is CVE-2025-11719 being actively exploited?

CVE-2025-11719 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.35%.

How severe is CVE-2025-11719?

CVE-2025-11719 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.35% probability of exploitation.

Which products are affected by CVE-2025-11719?

Affected products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2025-11719?

Upgrade affected software to a fixed version, for example Mozilla Firefox 144.0, Mozilla Thunderbird 144.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-11719 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.