{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-08T12:31:09.082","vulnerabilities":[{"cve":{"id":"CVE-2021-21254","sourceIdentifier":"security-advisories@github.com","published":"2021-01-29T22:15:14.797","lastModified":"2024-11-21T05:47:52.287","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"CKEditor 5 es un framework de edición de texto enriquecido de código abierto con una arquitectura modular.&#xa0;El plugin CKEditor 5 Markdown (@ckeditor/ckeditor5-markdown-gfm) anterior a versión 25.0.0, presenta una vulnerabilidad de denegación de servicio de expresiones regulares  (ReDoS).&#xa0;La vulnerabilidad permitió abusar de la expresión regular de reconocimiento de enlace, lo que podría causar una caída significativa en el rendimiento resultando en la congelación de la pestaña del navegador.&#xa0;Afecta a todos los usuarios que usan el plugin CKEditor 5 Markdown en la versión anterior a 24.0.0 e incluyéndola.&#xa0;El problema ha sido reconocido y parcheado.&#xa0;La corrección estará disponible en la versión 25.0.0"}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:P","baseScore":4.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":8.0,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-400"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:ckeditor:ckeditor5:*:*:*:*:*:*:*:*","versionEndExcluding":"25.0.0","matchCriteriaId":"8B47943C-76FE-4852-86F0-14CA6F0BD30D"}]}]}],"references":[{"url":"https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0","source":"security-advisories@github.com","tags":["Release Notes","Third Party Advisory"]},{"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm","source":"security-advisories@github.com"},{"url":"https://github.com/ckeditor/ckeditor5/releases/tag/v25.0.0","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"]},{"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-hgmg-hhc8-g5wr","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"https://www.npmjs.com/package/%40ckeditor/ckeditor5-markdown-gfm","source":"af854a3a-2127-422b-91ae-364da2661108"}]}}]}