Regular expression Denial of Service in Markdown plugin
CVE-2021-21254

6.5MEDIUM

Key Information:

Vendor

Ckeditor

Status
Ckeditor5
Vendor
CVE Published:
29 January 2021

What is 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.

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Affected Version(s)

ckeditor5 < 25.0.0

References

https://github.com/ckeditor/ckeditor5/security/advisories...
x_refsource_CONFIRM
https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0
x_refsource_MISC
https://www.npmjs.com/package/%40ckeditor/ckeditor5-markd...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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