Is CVE-2018-18493 being actively exploited?

CVE-2018-18493 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-18493?

CVE-2018-18493 has a CVSS 3.0 base score of 9.8 (CRITICAL).

CVE-2018-18493

CRITICAL · CVSS 9.8EPSS 5.0%EU EUVD

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of 64-bit. This results in a potentially exploitable crash. 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: 5.0% (92th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-10218)
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-2018-10218 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/show_bug.cgi?id=1504452(Issue Tracking, Permissions Required, Vendor Advisory)
https://lists.debian.org/debian-lts-announce/2018/12/msg00002.html(Mailing List, 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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