CVE-2021-21359

Denial of Service in Page Error Handling

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

TYPO3 es un sistema de gestión de contenidos web de código abierto basado en PHP. En TYPO3 versiones anteriores a la 9.5.25, 10.4.14, 11.1.1 la solicitud de recursos inválidos o inexistentes a través de HTTP desencadena el manejador de errores de la página que de nuevo podría recuperar el contenido que se muestra como mensaje de error de otra página. Esto lleva a un escenario en el que la aplicación se llama a sí misma de forma recursiva, amplificando el impacto del ataque inicial hasta que se superan los límites del servidor web. Esto se ha corregido en las versiones 9.5.25, 10.4.14 y 11.1.1

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-03-23 CVE Published
2023-12-06 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-405: Asymmetric Resource Consumption (Amplification)
CWE-674: Uncontrolled Recursion

CAPEC

References (3)

URL	Tag	Source
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p	Third Party Advisory
https://packagist.org/packages/typo3/cms-core	Release Notes

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://typo3.org/security/advisory/typo3-core-sa-2021-005	2021-03-26

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Typo3 Search vendor "Typo3"		Typo3 Search vendor "Typo3" for product "Typo3"				>= 9.0.0 < 9.5.25 Search vendor "Typo3" for product "Typo3" and version " >= 9.0.0 < 9.5.25"		-		Affected
Typo3 Search vendor "Typo3"		Typo3 Search vendor "Typo3" for product "Typo3"				>= 10.0.0 < 10.4.14 Search vendor "Typo3" for product "Typo3" and version " >= 10.0.0 < 10.4.14"		-		Affected
Typo3 Search vendor "Typo3"		Typo3 Search vendor "Typo3" for product "Typo3"				>= 11.0.0 < 11.1.1 Search vendor "Typo3" for product "Typo3" and version " >= 11.0.0 < 11.1.1"		-		Affected