Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ckeditor | Ckeditor5 | < 25.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0Release NotesThird Party Advisory
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wrThird Party Advisory
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
- https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0Release NotesThird Party Advisory
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wrThird Party Advisory
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
FAQ
What is CVE-2021-21254?
CVE-2021-21254 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 servi...
How severe is CVE-2021-21254?
CVE-2021-21254 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21254?
Check the references section above for vendor advisories and patch information. Affected products include: Ckeditor Ckeditor5.