Vulnerability Monitor

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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.

Published

2021-04-29T01:15:07.883

Last Modified

2024-11-21T05:48:15.750

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

2.9

Weaknesses
  • Type: Primary
    CWE-400
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application ckeditor ckeditor5-engine < 27.0.0 Yes
Application ckeditor ckeditor5-font < 27.0.0 Yes
Application ckeditor ckeditor5-image < 27.0.0 Yes
Application ckeditor ckeditor5-list < 27.0.0 Yes
Application ckeditor ckeditor5-markdown-gfm < 27.0.0 Yes
Application ckeditor ckeditor5-media-embed < 27.0.0 Yes
Application ckeditor ckeditor5-paste-from-office < 27.0.0 Yes
Application ckeditor ckeditor5-widget < 27.0.0 Yes
References