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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

AuthorNote
litios
This only affects CKEditor 5 and all releases currently use
CKEditor 4 (2022-03-16)

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

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)
mantic Needs triage

lunar Ignored
(end of life, was 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