CVE-2021-21391

Severity CVSS v4.0:

Pending analysis

Type:

CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')

Publication date:

29/04/2021

Last modified:

07/11/2023

Description

CKEditor 5 provides a WYSIWYG editing solution. This CVE affects the following npm packages: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office, and ckeditor5-widget. Following an internal audit, a regular expression denial of service (ReDoS) vulnerability has been discovered in multiple CKEditor 5 packages. The vulnerability allowed to abuse particular regular expressions, which could cause a significant performance drop resulting in a browser tab freeze. It affects all users using the CKEditor 5 packages listed above at version

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.50 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

6.50

Severity 3.x

MEDIUM

Vector 2.0

AV:N/AC:M/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 4.30 MEDIUM
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0

4.30

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:ckeditor:ckeditor5-engine::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-font::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-image::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-list::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-markdown-gfm::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-media-embed::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-paste-from-office::::::node.js::*		27.0.0 (excluding)
cpe:2.3:a:ckeditor:ckeditor5-widget::::::node.js::*		27.0.0 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-21391

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools