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Asymmetric Resource Consumption (Amplification)

CVE-2021-21359

Severity High
Score 7.5/10

Summary

TYPO3 is an open source PHP based web content management system. In TYPO3 versions 9.2.0 through 9.5.24, 10.0.0 through 10.4.13 and 11.0.0 through 11.1.0 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 vulnerability also affects typo3/cms-core versions 9.3.0 through 9.5.24, 10.0.0 through 10.4.13, 11.0.0 through 11.1.0 and typo3/cms-frontend versions 9.2.0 through 9.2.1.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • HIGH

CWE-405 - Asymmetric Resource Consumption (Amplification)

Software that does not appropriately monitor or control resource consumption can lead to adverse system performance.

Advisory Timeline

  • Published