Is CVE-2018-12405 being actively exploited?

CVE-2018-12405 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-12405?

CVE-2018-12405 has a CVSS 3.0 base score of 9.8 (CRITICAL).

CVE-2018-12405

CRITICAL · CVSS 9.8EPSS 3.2%EU EUVD

Mozilla developers and community members reported memory safety bugs present in Firefox 63 and Firefox ESR 60.3. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

Key facts

CVSS score: 9.8 (v3.0)
Severity: CRITICAL
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-119
EPSS score: 3.2% (88th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-4379)
Published: February 28, 2019
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-4379 in the EU Vulnerability Database. Last updated in EUVD on August 5, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
mozilla / firefox
mozilla / thunderbird
redhat / enterprise linux desktop
redhat / enterprise linux desktop
redhat / enterprise linux server
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server eus
redhat / enterprise linux server tus
redhat / enterprise linux workstation
redhat / enterprise linux workstation

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 7.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11039-2020 - archived

References

http://www.securityfocus.com/bid/106168(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHSA-2018:3831(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2018:3833(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0159(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:0160(Third Party Advisory)
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1494752%2C1498765%2C1503326%2C1505181%2C1500759%2C1504365%2C1506640%2C1503082%2C1502013%2C1510471(Broken Link, Issue Tracking, Vendor Advisory)
https://lists.debian.org/debian-lts-announce/2018/12/msg00002.html(Third Party Advisory)
https://security.gentoo.org/glsa/201903-04(Third Party Advisory)
https://usn.ubuntu.com/3844-1/(Third Party Advisory)
https://usn.ubuntu.com/3868-1/(Third Party Advisory)
https://www.debian.org/security/2018/dsa-4354(Third Party Advisory)
https://www.debian.org/security/2019/dsa-4362(Third Party Advisory)
https://www.mozilla.org/security/advisories/mfsa2018-29/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2018-30/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2018-31/(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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