CVE-2021-21254

 

Published at: - 29-01-2021 11:15

Last modified: - 09-08-2022 07:31

Total changes: - 3

Description

CKEditor 5 is an open source rich text editor framework with a modular architecture. The CKEditor 5 Markdown plugin (@ckeditor/ckeditor5-markdown-gfm) before version 25.0.0 has a regex denial of service (ReDoS) vulnerability. The vulnerability allowed to abuse link recognition regular expression, which could cause a significant performance drop resulting in browser tab freeze. It affects all users using CKEditor 5 Markdown plugin at version <= 24.0.0. The problem has been recognized and patched. The fix will be available in version 25.0.0.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0
• https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm
• https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr

 

Keywords

NVD

 

CVE-2021-21254

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures