CVE-2021-21391

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Source
https://cve.org/CVERecord?id=CVE-2021-21391
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21391.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-21391
Aliases
Downstream
Published
2021-04-29T01:15:07.883Z
Modified
2026-07-09T12:20:00.183386Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git / github.com/ckeditor/ckeditor5

Affected ranges

Type
GIT
Repo
https://github.com/ckeditor/ckeditor5
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
bf30aaa96be9b35cd6dca8563a7304fcd5092f63
Database specific 
{
    "cpe": [
        "cpe:2.3:a:ckeditor:ckeditor5-engine:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-font:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-image:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-list:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-markdown-gfm:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-media-embed:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-paste-from-office:*:*:*:*:*:node.js:*:*",
        "cpe:2.3:a:ckeditor:ckeditor5-widget:*:*:*:*:*:node.js:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "27.0.0"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

10.*
10.1.0
v0.*
v0.1.0
v0.10.0
v0.11.0
v0.2.0
v0.3.0
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v0.9.0
v1.*
v1.0.0-alpha.1
v1.0.0-alpha.2
v1.0.0-beta.1
v1.0.0-beta.2
v1.0.0-beta.4
v10.*
v10.0.0
v10.1.0
v11.*
v11.0.0
v11.1.0
v11.1.1
v11.2.0
v12.*
v12.0.0
v12.1.0
v12.2.0
v12.3.0
v12.3.1
v15.*
v15.0.0
v16.*
v16.0.0
v17.*
v17.0.0
v18.*
v18.0.0
v19.*
v19.0.0
v19.1.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21391.json"