What’s Vulnerable › Vulnerabilities

CVE-2018-5145

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-119

Description

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.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 17.10
• Debian Linux: 7.0, 8.0, 9.0
• Mozilla Firefox: before 52.7.0 — fixed in 52.7.0
• Mozilla Thunderbird: before 52.7.0 — fixed in 52.7.0
• RedHat Enterprise Linux Desktop: 6.0, 7.0
• RedHat Enterprise Linux Server: 6.0, 7.0
• RedHat Enterprise Linux Server Aus: 7.4, 7.6
• RedHat Enterprise Linux Server Eus: 7.4, 7.5, 7.6
• RedHat Enterprise Linux Server Tus: 7.4, 7.6
• RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 52.7.0; Mozilla Thunderbird 52.7.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/103384
• http://www.securitytracker.com/id/1040514
• https://access.redhat.com/errata/RHSA-2018:0526
• https://access.redhat.com/errata/RHSA-2018:0527
• https://access.redhat.com/errata/RHSA-2018:0647
• https://access.redhat.com/errata/RHSA-2018:0648
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1261175%2C1348955
• https://lists.debian.org/debian-lts-announce/2018/03/msg00010.html
• https://lists.debian.org/debian-lts-announce/2018/03/msg00029.html
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3545-1/
• https://www.debian.org/security/2018/dsa-4139

Get alerted when CVE-2018-5145 or the next vulnerability affects your stack