What is CVE-2025-12380?

CVE-2025-12380 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.8/10. Published 2025-10-28.

How severe is CVE-2025-12380?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Use After Free in Mozilla Firefox

CVE-2025-12380

Starting with Firefox 142, it was possible for a compromised child process to trigger a use-after-free in the GPU or browser process using WebGPU-related IPC calls. This may have been usable to escape the child process sandbox. This vulnerability was fixed in Firefox 144.0.2.

Vulnerability class: Use-After-Free

EPSS: 0.003 (23.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mozilla Firefox — versions 144.0.2

Weakness classification (CWE)

CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2025-12380?: CVE-2025-12380 is a critical-severity vulnerability in Mozilla Firefox, classified under Use After Free. CVSS score: 9.8/10. Published 2025-10-28.
How severe is CVE-2025-12380?: Critical severity. CVSS v3 base score is 9.8 out of 10.