CVE-2025-14324Network attack vector

Arbitrary code execution via undisclosed JIT miscompilation

Published Dec 9, 2025 · Updated Apr 13, 2026

JIT miscompilation in Mozilla Firefox before 146 and Thunderbird before 146 allows remote attackers to execute arbitrary code. Mozilla identifies the JavaScript Engine's JIT component but has not disclosed the faulty compilation operation or triggering input. The affected ESR lines are Firefox ESR before 115.31 and before 140.6 and Thunderbird ESR before 140.6; Thunderbird disables scripting while reading email, limiting exposure to browser-like contexts.

CVSS severity9.8
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

JIT miscompilation in Mozilla Firefox before 146 and Thunderbird before 146 allows remote attackers to execute arbitrary code. Mozilla identifies the JavaScript Engine's JIT component but has not disclosed the faulty compilation operation or triggering input. The affected ESR lines are Firefox ESR before 115.31 and before 140.6 and Thunderbird ESR before 140.6; Thunderbird disables scripting while reading email, limiting exposure to browser-like contexts.

The record

CVE
CVE-2025-14324
Published
Dec 9, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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