CVE-2021-21254
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Ckeditor5
PublishedJan 29, 2021
First seenJan 29, 2021
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- ckeditor ckeditor525.0.0 or later
- @ckeditor/ckeditor5-markdown-gfm25.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ckeditor ckeditor5 | v < 25.0.0 | 25.0.0 |
| @ckeditor/ckeditor5-markdown-gfmnpm | v < 25.0.0 | 25.0.0 |
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