CVE-2021-21359
packagist/typo3/cms
Asymmetric Resource Consumption (Amplification)
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.
All versions starting from 9.0.0 before 9.5.25, all versions starting from 10.0.0 before 10.4.14, all versions starting from 11.0.0 before 11.1.1
Upgrade to versions 9.5.25, 10.4.14, 11.1.1 or above.
2021-03-29
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