CVE-2021-21254CWE-400

Regular expression Denial of Service in Markdown plugin

Medium · published January 29, 2021

CVSS v3.1
6.5
EPSS
2%
Percentile
78.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.01792 · 78.2th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2021-01-29T21:55Z
EPSS history
Timeline
  • 29 JAN 21:55Z
    Regular expression Denial of Service in Markdown plugin
    cvelistv5