CVE Vulnerability

CVE-2021-21254

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.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

Scope

6.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0 Release Notes Third Party Advisory
https://www.npmjs.com/package/@ckeditor/ckeditor5-markdown-gfm Release Notes Third Party Advisory
https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:*
Information

Published : 2021-01-29 10:15

Updated : 2022-08-09 05:31

NVD link : CVE-2021-21254

Mitre link : CVE-2021-21254

Products Affected
No products.
CWE
CWE-400