JIT Miscompilation Vulnerability in Firefox by Mozilla
CVE-2025-14330

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
9 December 2025

What is CVE-2025-14330?

A vulnerability has been identified in the JavaScript Engine's Just-In-Time (JIT) compilation component of Firefox, which could lead to improper execution of JavaScript code. This can potentially allow an attacker to exploit the flaw to compromise the integrity and security of affected user systems. Users running versions prior to Firefox 146 and Firefox ESR versions below 140.6 should be particularly cautious, as they are susceptible to this issue.

Affected Version(s)

Firefox < 146

Firefox ESR < 140.6

Thunderbird < 146

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1997503
https://www.mozilla.org/security/advisories/mfsa2025-92/
https://www.mozilla.org/security/advisories/mfsa2025-94/

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

Rong Bao
JSON
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CVE-2025-14330 : JIT Miscompilation Vulnerability in Firefox by Mozilla