What is CVE-2019-25136?

CVE-2019-25136 is a critical-severity vulnerability in Mozilla Firefox. CVSS score: 10.0/10. Published 2023-06-19.

How severe is CVE-2019-25136?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Mozilla Firefox

CVE-2019-25136

A compromised child process could have injected XBL Bindings into privileged CSS rules, resulting in arbitrary code execution and a sandbox escape. This vulnerability affects Firefox < 70.

Published 2023-06-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.8th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

References

bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)
www.mozilla.org/security/advisories/mfsa2019-34/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-25136?: CVE-2019-25136 is a critical-severity vulnerability in Mozilla Firefox. CVSS score: 10.0/10. Published 2023-06-19.
How severe is CVE-2019-25136?: Critical severity. CVSS v3 base score is 10.0 out of 10.