What is CVE-2024-3860?

CVE-2024-3860 is a medium-severity vulnerability in Mozilla Firefox, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.2/10. Published 2024-04-16.

How severe is CVE-2024-3860?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Vulnerability in Mozilla Firefox

CVE-2024-3860

An out-of-memory condition during object initialization could result in an empty shape list. If the JIT subsequently traced the object it would crash. This vulnerability affects Firefox < 125.

Published 2024-04-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (5.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)
www.mozilla.org/security/advisories/mfsa2024-18/ (Vendor Advisory)

Frequently asked questions

What is CVE-2024-3860?: CVE-2024-3860 is a medium-severity vulnerability in Mozilla Firefox, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.2/10. Published 2024-04-16.
How severe is CVE-2024-3860?: Medium severity. CVSS v3 base score is 6.2 out of 10.