UBUNTU-CVE-2021-21391

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Source
https://ubuntu.com/security/CVE-2021-21391
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21391.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-21391
Related
Published
2021-04-29T01:15:00Z
Modified
2025-04-23T15:12:07Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.

References

Affected packages

Ubuntu:Pro:18.04:LTS / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-4?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-3
3.6.6.1+dfsg-4

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:22.04:LTS / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-7?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-7

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.10 / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-7?arch=source&distro=oracular

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-7

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.04:LTS / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-7?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-7

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:25.04 / ckeditor3

Package

Name
ckeditor3
Purl
pkg:deb/ubuntu/ckeditor3@3.6.6.1+dfsg-7?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.6.6.1+dfsg-7

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}