CVE-2025-14330

moderate-risk

Published 2025-12-09

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Do I need to act?

0.09% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (4)

Firefox

Thunderbird

Affected Vendors

Mozilla

References (5)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1997503

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-92/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-94/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-95/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2025-96/

/ 100

moderate-risk

Severity 32/34 · Critical

Exploitability 0/34 · Minimal

Exposure 10/34 · Low