Vulnerability · Published Mar 23, 2021 · Assigned by GitHub_M

CVE-2021-21359Denial of Service in Page Error Handling

Medium 5.9

In plain English

A medium-severity security flaw in TYPO3.CMS from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)1.7%top 22.3% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	typo3/cms	10.4.14	GHSA-4p9g-qgx9-397p
Packagist	typo3/cms	11.1.1	GHSA-4p9g-qgx9-397p
Packagist	typo3/cms	9.5.25	GHSA-4p9g-qgx9-397p
Packagist	typo3/cms-core	10.4.14	GHSA-4p9g-qgx9-397p
Packagist	typo3/cms-core	11.1.1	GHSA-4p9g-qgx9-397p
Packagist	typo3/cms-core	9.5.25	GHSA-4p9g-qgx9-397p

Affected products (as reported)

Vendor	Product	Versions
TYPO3	TYPO3.CMS	>= 9.0.0, <= 9.5.24>= 10.0.0, <= 10.4.13>= 11.0.0, <= 11.1.0

Weakness: CWE-674, CWE-405 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://packagist.org/packages/typo3/cms-core x_refsource_MISC
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p x_refsource_CONFIRM
https://typo3.org/security/advisory/typo3-core-sa-2021-005 x_refsource_MISC