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nvd[email protected]NVD:CVE-2021-21391
HistoryApr 29, 2021 - 1:15 a.m.

CVE-2021-21391

2021-04-2901:15:07
CWE-400
web.nvd.nist.gov

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

0.005 Low

EPSS

Percentile

76.0%

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 <= 26.0.0. The problem has been recognized and patched. The fix will be available in version 27.0.0.

Affected configurations

NVD
Node
ckeditorckeditor5-engineRange<27.0.0node.js
OR
ckeditorckeditor5-fontRange<27.0.0node.js
OR
ckeditorckeditor5-imageRange<27.0.0node.js
OR
ckeditorckeditor5-listRange<27.0.0node.js
OR
ckeditorckeditor5-markdown-gfmRange<27.0.0node.js
OR
ckeditorckeditor5-media-embedRange<27.0.0node.js
OR
ckeditorckeditor5-paste-from-officeRange<27.0.0node.js
OR
ckeditorckeditor5-widgetRange<27.0.0node.js

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:N/A:P

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

0.005 Low

EPSS

Percentile

76.0%