Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 57.9%
CVSS Severity
CVSS v3 Score 6.5
CVSS v2 Score 4.0
References
- https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
- https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr
- https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm
Products affected by CVE-2021-21254
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cpe:2.3:a:ckeditor:ckeditor5:0.1.0
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cpe:2.3:a:ckeditor:ckeditor5:0.10.0
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cpe:2.3:a:ckeditor:ckeditor5:0.11.0
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cpe:2.3:a:ckeditor:ckeditor5:0.2.0
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cpe:2.3:a:ckeditor:ckeditor5:0.3.0
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cpe:2.3:a:ckeditor:ckeditor5:0.4.0
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cpe:2.3:a:ckeditor:ckeditor5:0.5.0
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cpe:2.3:a:ckeditor:ckeditor5:0.6.0
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cpe:2.3:a:ckeditor:ckeditor5:0.7.0
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cpe:2.3:a:ckeditor:ckeditor5:0.8.0
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cpe:2.3:a:ckeditor:ckeditor5:0.9.0
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cpe:2.3:a:ckeditor:ckeditor5:1.0.0
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cpe:2.3:a:ckeditor:ckeditor5:10.0.0
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cpe:2.3:a:ckeditor:ckeditor5:10.0.1
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cpe:2.3:a:ckeditor:ckeditor5:10.1.0
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cpe:2.3:a:ckeditor:ckeditor5:11.0.0
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cpe:2.3:a:ckeditor:ckeditor5:11.0.1
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cpe:2.3:a:ckeditor:ckeditor5:11.1.0
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cpe:2.3:a:ckeditor:ckeditor5:11.1.1
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cpe:2.3:a:ckeditor:ckeditor5:11.2.0
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cpe:2.3:a:ckeditor:ckeditor5:12.0.0
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cpe:2.3:a:ckeditor:ckeditor5:12.1.0
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cpe:2.3:a:ckeditor:ckeditor5:12.2.0
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cpe:2.3:a:ckeditor:ckeditor5:12.3.0
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cpe:2.3:a:ckeditor:ckeditor5:12.3.1
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cpe:2.3:a:ckeditor:ckeditor5:12.4.0
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cpe:2.3:a:ckeditor:ckeditor5:15.0.0
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cpe:2.3:a:ckeditor:ckeditor5:16.0.0
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cpe:2.3:a:ckeditor:ckeditor5:17.0.0
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cpe:2.3:a:ckeditor:ckeditor5:18.0.0
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cpe:2.3:a:ckeditor:ckeditor5:19.0.0
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cpe:2.3:a:ckeditor:ckeditor5:19.1.0
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cpe:2.3:a:ckeditor:ckeditor5:19.1.1
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cpe:2.3:a:ckeditor:ckeditor5:20.0.0
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cpe:2.3:a:ckeditor:ckeditor5:21.0.0
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cpe:2.3:a:ckeditor:ckeditor5:22.0.0
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cpe:2.3:a:ckeditor:ckeditor5:23.0.0
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cpe:2.3:a:ckeditor:ckeditor5:23.1.0
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cpe:2.3:a:ckeditor:ckeditor5:24.0.0