CVE Vulnerability

CVE-2021-21391

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.

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

6.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-engine Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-image Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-media-embed Product Third Party Advisory
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-list Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-font Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-paste-from-office Product Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-widget Product Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:ckeditor:ckeditor5-widget:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-paste-from-office:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-media-embed:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-markdown-gfm:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-list:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-image:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-font:*:*:*:*:*:node.js:*:*
cpe:2.3:a:ckeditor:ckeditor5-engine:*:*:*:*:*:node.js:*:*
Information

Published : 2021-04-29 01:15

Updated : 2021-05-10 06:22

NVD link : CVE-2021-21391

Mitre link : CVE-2021-21391

Products Affected
No products.
CWE
CWE-400