CVE-2018-12377

Publication date 6 September 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
firefox	18.04 LTS bionic	Fixed 62.0+build2-0ubuntu0.18.04.3
	16.04 LTS xenial	Fixed 62.0+build2-0ubuntu0.16.04.3
	14.04 LTS trusty	Fixed 62.0+build2-0ubuntu0.14.04.3
firefox-esr	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
thunderbird	18.04 LTS bionic	Fixed 1:60.2.1+build1-0ubuntu0.18.04.2
	16.04 LTS xenial	Fixed 1:60.2.1+build1-0ubuntu0.16.04.4
	14.04 LTS trusty	Fixed 1:60.2.1+build1-0ubuntu0.14.04.2

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3761-1
Firefox vulnerabilities
6 September 2018

USN-3793-1
Thunderbird vulnerabilities
15 October 2018