CVE-2021-21391

{"containers": {"cna": {"affected": [{"product": "ckeditor5", "vendor": "ckeditor", "versions": [{"status": "affected", "version": "< 27.0.0"}]}], "descriptions": [{"lang": "en", "value": "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. 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{"affected": [{"affectedData": [{"product": "ckeditor5", "vendor": "ckeditor", "versions": [{"status": "affected", "version": "< 27.0.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:ckeditor:ckeditor5-engine:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "67079ED7-67C7-43E6-B2ED-FC8F38073844", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-font:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "49A57CEA-AF9A-406B-97E3-0174F98CF961", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-image:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "8AA7F807-41B2-492E-AC3F-ECC940A9D087", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-list:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "ECFF8404-52EF-49E0-BB96-5C366362DD9E", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-markdown-gfm:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "2DDE77C4-ECA2-490F-8B67-D9CC0990FF33", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-media-embed:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "C9FD93F0-391D-4910-846C-B972D0737066", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-paste-from-office:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "2B80F6F9-37B6-4FE3-B7C6-07931AD022BD", "versionEndExcluding": "27.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:ckeditor:ckeditor5-widget:*:*:*:*:*:node.js:*:*", "matchCriteriaId": "2BD4B908-0A73-4410-813D-34A4108052D0", "versionEndExcluding": "27.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "CKEditor 5 proporciona una soluci\u00f3n de edici\u00f3n WYSIWYG.&#xa0;Este CVE afecta a los siguientes paquetes npm: ckeditor5-engine, ckeditor5-font, ckeditor5-image, ckeditor5-list, ckeditor5-markdown-gfm, ckeditor5-media-embed, ckeditor5-paste-from-office y ckeditor5-widget.&#xa0;Despu\u00e9s de una auditor\u00eda interna, se detect\u00f3 una vulnerabilidad de denegaci\u00f3n de servicio de expresi\u00f3n regular (ReDoS) en varios paquetes de CKEditor 5.&#xa0;La vulnerabilidad permiti\u00f3 abusar de determinadas expresiones regulares, lo que podr\u00eda causar una perdida significativa del rendimiento, lo que causar\u00eda la congelaci\u00f3n de la pesta\u00f1a del navegador.&#xa0;Afecta a todos los usuarios que usan los paquetes CKEditor 5 enumerados anteriormente en la versi\u00f3n anterior a 26.0.0 e incluy\u00e9ndola.&#xa0;El problema ha sido reconocido y parcheado.&#xa0;La correcci\u00f3n estar\u00e1 disponible en la versi\u00f3n 27.0.0"}], "id": "CVE-2021-21391", "lastModified": "2026-06-17T03:35:28.500", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": 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