CVE-2020-6821

Publication date 7 April 2020

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Read the notes from the security team

Status

Package Ubuntu Release Status
mozjs52 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
19.10 eoan Ignored end of life
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
mozjs68 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
19.10 eoan Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
firefox 24.04 LTS noble
Fixed 75.0+build3-0ubuntu1
23.10 mantic
Fixed 75.0+build3-0ubuntu1
23.04 lunar
Fixed 75.0+build3-0ubuntu1
22.10 kinetic
Fixed 75.0+build3-0ubuntu1
22.04 LTS jammy
Fixed 75.0+build3-0ubuntu1
21.10 impish
Fixed 75.0+build3-0ubuntu1
21.04 hirsute
Fixed 75.0+build3-0ubuntu1
20.10 groovy
Fixed 75.0+build3-0ubuntu1
20.04 LTS focal
Fixed 75.0+build3-0ubuntu1
19.10 eoan
Fixed 75.0+build3-0ubuntu0.19.10.1
18.04 LTS bionic
Fixed 75.0+build3-0ubuntu0.18.04.1
16.04 LTS xenial
Fixed 75.0+build3-0ubuntu0.16.04.1
14.04 LTS trusty Not in release
mozjs38 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
mozjs60 24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Ignored end of life
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
thunderbird 24.04 LTS noble
Fixed 1:68.7.0+build1-0ubuntu1
23.10 mantic
Fixed 1:68.7.0+build1-0ubuntu1
23.04 lunar
Fixed 1:68.7.0+build1-0ubuntu1
22.10 kinetic
Fixed 1:68.7.0+build1-0ubuntu1
22.04 LTS jammy
Fixed 1:68.7.0+build1-0ubuntu1
21.10 impish
Fixed 1:68.7.0+build1-0ubuntu1
21.04 hirsute
Fixed 1:68.7.0+build1-0ubuntu1
20.10 groovy
Fixed 1:68.7.0+build1-0ubuntu1
20.04 LTS focal
Fixed 1:68.7.0+build1-0ubuntu1
19.10 eoan
Fixed 1:68.7.0+build1-0ubuntu0.19.10.1
18.04 LTS bionic
Fixed 1:68.7.0+build1-0ubuntu0.18.04.1
16.04 LTS xenial
Fixed 1:68.7.0+build1-0ubuntu0.16.04.2
14.04 LTS trusty Not in release

Notes

tyhicks

mozjs contains a copy of the SpiderMonkey JavaScript engine

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

    • USN-4328-1
    • Thunderbird vulnerabilities
    • 13 April 2020
    • USN-4335-1
    • Thunderbird vulnerabilities
    • 21 April 2020

Other references