CVE-2021-21391 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  GitHub, Inc.
Base Score:  6.5 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID CWE Name Source
CWE-400 Uncontrolled Resource Consumption Provider acceptance level GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-21391
NVD Published Date:
04/28/2021
NVD Last Modified:
05/10/2021
Source:
GitHub, Inc.