Is CVE-2018-5145 being actively exploited?

CVE-2018-5145 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-5145?

CVE-2018-5145 has a CVSS 3.0 base score of 9.8 (CRITICAL).

CVE-2018-5145

CRITICAL · CVSS 9.8EPSS 2.9%EU EUVD

Memory safety bugs were reported in Firefox ESR 52.6. 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 Firefox ESR < 52.7 and Thunderbird < 52.7.

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: 2.9% (87th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-16931)
Published: June 11, 2018
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-16931 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
debian / debian 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 aus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux server eus
redhat / enterprise linux server tus
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/103384(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1040514(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHSA-2018:0526(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2018:0527(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2018:0647(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2018:0648(Third Party Advisory)
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1261175%2C1348955(Issue Tracking, Permissions Required, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2018/03/msg00010.html(Mailing List, Third Party Advisory)
https://lists.debian.org/debian-lts-announce/2018/03/msg00029.html(Mailing List, Third Party Advisory)
https://security.gentoo.org/glsa/201811-13(Third Party Advisory)
https://usn.ubuntu.com/3545-1/(Third Party Advisory)
https://www.debian.org/security/2018/dsa-4139(Third Party Advisory)
https://www.debian.org/security/2018/dsa-4155(Third Party Advisory)
https://www.mozilla.org/security/advisories/mfsa2018-07/(Vendor Advisory)
https://www.mozilla.org/security/advisories/mfsa2018-09/(Vendor Advisory)

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

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain