{"action":"Upgrade typo3/cms to 9.5.25 or later.","affected":[{"fixed":"10.4.14","introduced":"10.0.0"},{"fixed":"11.1.1","introduced":"11.0.0"},{"fixed":"9.5.25","introduced":"9.0.0"}],"component":"typo3/cms","cve_ids":["CVE-2021-21359"],"ecosystem":"Packagist","epss":0.01731,"exploited":false,"fixed_versions":["10.4.14","11.1.1","9.5.25"],"ghsa_id":"GHSA-4p9g-qgx9-397p","id":"tcs_01M5KEV631C3AJ1WWSRXG3YY8M","modified_at":"2026-07-08T06:27:45.241943005Z","published_at":"2021-03-23T01:54:09Z","references":["https://osv.dev/vulnerability/GHSA-4p9g-qgx9-397p","https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p","https://nvd.nist.gov/vuln/detail/CVE-2021-21359","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21359.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21359.yaml","https://packagist.org/packages/typo3/cms-core","https://typo3.org/security/advisory/typo3-core-sa-2021-005"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"GHSA-4p9g-qgx9-397p#Packagist/typo3/cms","url":"https://osv.dev/vulnerability/GHSA-4p9g-qgx9-397p"}],"summary":"Denial of Service in Page Error Handling"}