CVE-2021-21359
Denial of Service in Page Error Handling
5.9
MEDIUM
CVSS 3.1
EPSS 1.7%
Description
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.
How to fix CVE-2021-21359
To remediate CVE-2021-21359, upgrade the affected package to a fixed version below.
- —upgrade to 10.4.14 or later
- —upgrade to 10.4.14 or later
Is CVE-2021-21359 being exploited?
Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 10.0.0, < 10.4.14
- >= 10.0.0, < 10.4.14
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C |