Description: 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.
CVE-2021-21391
Published Date: 2021-04-29T01:15Z
Last Modified: 2023-11-07T03:30Z
CVSS Score: 6.5 (MEDIUM)
EPSS Score: 0.48%
Risk Score: 4.55 (MEDIUM)
Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.
CVSS:
6.5 |
EPSS:
0.48%
Mitre ATT&CK Technical v15.1
T1053.002 – At
Technical Analysis & Mitigation Measures
Reference Links
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-3rh3-wfr4-76mj
https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
https://www.npmjs.com/package/%40ckeditor/ckeditor5-engine
https://www.npmjs.com/package/%40ckeditor/ckeditor5-font
https://www.npmjs.com/package/%40ckeditor/ckeditor5-image
https://www.npmjs.com/package/%40ckeditor/ckeditor5-list
https://www.npmjs.com/package/%40ckeditor/ckeditor5-media-embed
https://www.npmjs.com/package/%40ckeditor/ckeditor5-paste-from-office
https://www.npmjs.com/package/%40ckeditor/ckeditor5-widget
Vendor - Produce - Version
ckeditor5-widget - ckeditor, ckeditor5-paste-from-office - ckeditor, ckeditor5-media-embed - ckeditor, ckeditor5-markdown-gfm - ckeditor, ckeditor5-list - ckeditor, ckeditor5-image - ckeditor, ckeditor5-font - ckeditor, ckeditor5-engine - ckeditor
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