RCE in Mozilla Firefox

CVE-2025-11153

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 143.0.3.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.002 (12.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mozilla Firefox — versions 143.0.3

Weakness classification (CWE)

CWE-94 — Code Injection

Public proof-of-concept exploits

References

security@mozilla.org (Permissions Required, Issue Tracking)
security@mozilla.org (Vendor Advisory)

Frequently asked questions

What is CVE-2025-11153?: CVE-2025-11153 is a high-severity vulnerability in Mozilla Firefox, classified under Code Injection. CVSS score: 7.5/10. Published 2025-09-30.
How severe is CVE-2025-11153?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-11153 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.