Regular expression Denial of Service in multiple packages
CVE-2021-21391

6.5MEDIUM

Key Information:

Vendor

Ckeditor

Status
Ckeditor5
Vendor
CVE Published:
29 April 2021

What is 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.

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Deploy the Patch

Affected Version(s)

ckeditor5 < 27.0.0

References

https://www.npmjs.com/package/%40ckeditor/ckeditor5-markd...
x_refsource_MISC
https://github.com/ckeditor/ckeditor5/security/advisories...
x_refsource_CONFIRM
https://www.npmjs.com/package/%40ckeditor/ckeditor5-engine
x_refsource_MISC

EPSS Score

8% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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