What’s Vulnerable › Vulnerabilities

CVE-2018-12377

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-18 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 18.04
• Debian Linux: 8.0, 9.0
• Mozilla Firefox: before 60.2.0; before 62.0 — fixed in 60.2.0, 62.0
• Mozilla Thunderbird: before 60.2.1 — fixed in 60.2.1
• RedHat Enterprise Linux Desktop: 6.0, 7.0
• RedHat Enterprise Linux Server: 6.0, 7.0
• RedHat Enterprise Linux Server Aus: 7.6
• RedHat Enterprise Linux Server Eus: 7.5, 7.6
• RedHat Enterprise Linux Server Tus: 7.6
• RedHat Enterprise Linux Workstation: 6.0, 7.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.2.0, 62.0; Mozilla Thunderbird 60.2.1. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/105280
• http://www.securitytracker.com/id/1041610
• https://access.redhat.com/errata/RHSA-2018:2692
• https://access.redhat.com/errata/RHSA-2018:2693
• https://access.redhat.com/errata/RHSA-2018:3403
• https://access.redhat.com/errata/RHSA-2018:3458
• https://bugzilla.mozilla.org/show_bug.cgi?id=1470260
• https://lists.debian.org/debian-lts-announce/2018/11/msg00011.html
• https://security.gentoo.org/glsa/201810-01
• https://security.gentoo.org/glsa/201811-13
• https://usn.ubuntu.com/3761-1/
• https://usn.ubuntu.com/3793-1/

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