CVE-2017-7753

Publication date 10 August 2017

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.1 · Critical

Score breakdown

Description

An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Read the notes from the security team

Status

Package Ubuntu Release Status
firefox 19.04 disco
Fixed 55.0.2+build1-0ubuntu4
18.10 cosmic
Fixed 55.0.2+build1-0ubuntu4
18.04 LTS bionic
Fixed 55.0.2+build1-0ubuntu4
17.10 artful
Fixed 55.0.2+build1-0ubuntu4
17.04 zesty
Fixed 55.0.1+build2-0ubuntu0.17.04.2
16.04 LTS xenial
Fixed 55.0.1+build2-0ubuntu0.16.04.2
14.04 LTS trusty
Fixed 55.0.1+build2-0ubuntu0.14.04.2
mozjs38 19.04 disco Not in release
18.10 cosmic Not in release
18.04 LTS bionic
Not affected
17.10 artful Ignored end of life
17.04 zesty Ignored end of life
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
thunderbird 19.04 disco
Fixed 1:52.4.0+build1-0ubuntu2
18.10 cosmic
Fixed 1:52.4.0+build1-0ubuntu2
18.04 LTS bionic
Fixed 1:52.4.0+build1-0ubuntu2
17.10 artful
Fixed 1:52.4.0+build1-0ubuntu2
17.04 zesty
Fixed 1:52.3.0+build1-0ubuntu0.17.04.1
16.04 LTS xenial
Fixed 1:52.3.0+build1-0ubuntu0.16.04.1
14.04 LTS trusty
Fixed 1:52.3.0+build1-0ubuntu0.14.04.1

Notes

tyhicks

mozjs38 contains a copy of the SpiderMonkey JavaScript engine

Severity score breakdown

Parameter Value
Base score 9.1 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3391-1
    • Firefox vulnerabilities
    • 15 August 2017
    • USN-3416-1
    • Thunderbird vulnerabilities
    • 14 September 2017

Other references