{"id":"CVE-2021-21359","details":"TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.25, 10.4.14, 11.1.1 requesting invalid or non-existing resources via HTTP triggers the page error handler which again could retrieve content to be shown as error message from another page. This leads to a scenario in which the application is calling itself recursively - amplifying the impact of the initial attack until the limits of the web server are exceeded. This is fixed in versions 9.5.25, 10.4.14, 11.1.1.","aliases":["BIT-typo3-2021-21359","GHSA-4p9g-qgx9-397p"],"modified":"2026-05-18T18:05:09.463404Z","published":"2021-03-23T02:15:12.893Z","references":[{"type":"ADVISORY","url":"https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p"},{"type":"ADVISORY","url":"https://packagist.org/packages/typo3/cms-core"},{"type":"ADVISORY","url":"https://typo3.org/security/advisory/typo3-core-sa-2021-005"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/typo3/typo3","events":[{"introduced":"41235ff8e38c6f3401df03ae8beddd62d662c525"},{"fixed":"98b19b1727f002a9d20359f7c341c7981086989f"},{"introduced":"c91b70e450c52d29ffb08115fffbb7832b15a330"},{"fixed":"9f8b73eb73f0f9834979641c02708dc168e36eda"},{"introduced":"6a5e2d4097ef0a0e3ea955af93cf83810d6fa234"},{"fixed":"67471a2b5bf30acc0225fa0860e882c056c60547"}],"database_specific":{"source":"CPE_FIELD","cpe":"cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"9.0.0"},{"fixed":"9.5.25"},{"introduced":"10.0.0"},{"fixed":"10.4.14"},{"introduced":"11.0.0"},{"fixed":"11.1.1"}]}}],"versions":["v11.1.0","v10.4.13","v11.0.0","v10.4.12","v10.4.11","v9.5.24","v10.4.10","v9.5.23","v10.4.9","v9.5.22","v10.4.8","v10.4.7","v9.5.21","v10.4.6","v9.5.20","v10.4.5","v10.4.4","v9.5.19","v10.4.3","v9.5.18","v9.5.17","v10.4.2","v10.4.1","v9.5.16","v10.4.0","v9.5.15","v10.3.0","v9.5.14","v9.5.13","v9.5.12","v10.2.0","v9.5.11","v9.5.10","v10.1.0","v9.5.9","v10.0.0","v9.5.8","v9.5.7","v9.5.6","v9.5.5","v9.5.4","v9.5.3","v9.5.2","v9.5.1","v9.5.0","v9.4.0","v9.3.0","v9.2.0","v9.1.0","v9.0.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-21359.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}