CVE-2025-11153Network attack vector

Code injection via JavaScript JIT miscompilation

Published Sep 30, 2025 · Updated Sep 30, 2025

Code injection in Firefox before 143.0.3 allows remote attackers to alter execution through JavaScript JIT miscompilation. The JavaScript Engine JIT component generates incorrect executable code, but Mozilla has not disclosed the triggering input or compiler operation. No privileges or user interaction are required; published evidence establishes integrity impact without reported data disclosure or service interruption.

CVSS severity7.5
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Firefox before 143.0.3 allows remote attackers to alter execution through JavaScript JIT miscompilation. The JavaScript Engine JIT component generates incorrect executable code, but Mozilla has not disclosed the triggering input or compiler operation. No privileges or user interaction are required; published evidence establishes integrity impact without reported data disclosure or service interruption.

The record

CVE
CVE-2025-11153
Published
Sep 30, 2025
Updated
Sep 30, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-94, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <143.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <143.0.3

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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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