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

2021-03-2301:55:19

CWE-405

CWE-674

GitHub_M

www.cve.org

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

6.5 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

54.7%

JSON

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.

CNA Affected

[
  {
    "product": "TYPO3.CMS",
    "vendor": "TYPO3",
    "versions": [
      {
        "status": "affected",
        "version": ">= 9.0.0, <= 9.5.24"
      },
      {
        "status": "affected",
        "version": ">= 10.0.0, <= 10.4.13"
      },
      {
        "status": "affected",
        "version": ">= 11.0.0, <= 11.1.0"
      }
    ]
  }
]