CVE-2025-14325Public exploitNetwork attack vector

JIT execution corruption via property-result type confusion

Published Dec 9, 2025 · Updated Apr 13, 2026

Type confusion in Mozilla Firefox and Thunderbird before 146, including ESR before 140.6, allows attackers to corrupt JIT execution. A repeated own-property lookup can change PropertyResult from NativeProperty to TypedArrayElement, yet tryAttachAddSlotStub still calls propertyInfo() and emits a native-slot store from attacker-controlled array-index data. Execution of crafted JavaScript is required; Thunderbird mail reading disables scripting, limiting exposure there to browser-like contexts.

CVSS severity7.3
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Mozilla Firefox and Thunderbird before 146, including ESR before 140.6, allows attackers to corrupt JIT execution. A repeated own-property lookup can change PropertyResult from NativeProperty to TypedArrayElement, yet tryAttachAddSlotStub still calls propertyInfo() and emits a native-slot store from attacker-controlled array-index data. Execution of crafted JavaScript is required; Thunderbird mail reading disables scripting, limiting exposure there to browser-like contexts.

The record

CVE
CVE-2025-14325
Published
Dec 9, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, 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

7.3CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

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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 exploitPublished

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

Public exploit references

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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