CVE-2021-21391
Published: 29 April 2021
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.
Notes
| Author | Note |
|---|---|
| litios | This only affects CKEditor 5 and all releases currently use CKEditor 4 (2022-03-16) |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
ckeditor Launchpad, Ubuntu, Debian |
jammy |
Not vulnerable
(code not present)
|
| kinetic |
Not vulnerable
(code not present)
|
|
| impish |
Not vulnerable
(code not present)
|
|
| bionic |
Not vulnerable
(code not present)
|
|
| focal |
Not vulnerable
(code not present)
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Not vulnerable
(code not present)
|
|
| lunar |
Not vulnerable
(code not present)
|
|
| mantic |
Not vulnerable
(code not present)
|
|
|
ckeditor3 Launchpad, Ubuntu, Debian |
focal |
Needs triage
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Ignored
(end of life)
|
|
| jammy |
Needs triage
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
| kinetic |
Ignored
(end of life, was needs-triage)
|
|
| bionic |
Needs triage
|
|
| impish |
Ignored
(end of life)
|
|
| lunar |
Needs triage
|
|
| mantic |
Needs triage
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21391
- https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm
- https://www.npmjs.com/package/@ckeditor/ckeditor5-engine
- https://www.npmjs.com/package/@ckeditor/ckeditor5-image
- https://www.npmjs.com/package/@ckeditor/ckeditor5-media-embed
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj
- https://www.npmjs.com/package/@ckeditor/ckeditor5-list
- https://www.npmjs.com/package/@ckeditor/ckeditor5-font
- https://www.npmjs.com/package/@ckeditor/ckeditor5-paste-from-office
- https://www.npmjs.com/package/@ckeditor/ckeditor5-widget
- NVD
- Launchpad
- Debian