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TI-2021-04458 Aliases CVE-2021-21359GHSA-4p9g-qgx9-397p

Denial of Service in Page Error Handling

Priority LOW 36CWE-405Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-674.

Summary

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.

Why it matters now

EPSS 0.01731 77th percentileScored 2026-11-07
Fix Fixed typo3/cms-core (Packagist): 10.4.14, 11.1.1, 9.5.25typo3/cms (Packagist): 10.4.14, 11.1.1, 9.5.25

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TYPO3TYPO3.CMS9.0.0 – 9.5.24; 10.0.0 – 10.4.13; 11.0.0 – 11.1.0—No fix listedCNA
—typo3/cms-core (Packagist)10.0.0 to before 10.4.1410.4.14Patch availableGHSA-4p9g-qgx9-397p
—typo3/cms-core (Packagist)11.0.0 to before 11.1.111.1.1Patch availableGHSA-4p9g-qgx9-397p
—typo3/cms-core (Packagist)9.0.0 to before 9.5.259.5.25Patch availableGHSA-4p9g-qgx9-397p
—typo3/cms (Packagist)10.0.0 to before 10.4.1410.4.14Patch availableGHSA-4p9g-qgx9-397p
—typo3/cms (Packagist)11.0.0 to before 11.1.111.1.1Patch availableGHSA-4p9g-qgx9-397p
—typo3/cms (Packagist)9.0.0 to before 9.5.259.5.25Patch availableGHSA-4p9g-qgx9-397p
  • TYPO3.CMS VendorTYPO3 Affected 9.0.0 – 9.5.24; 10.0.0 – 10.4.13; 11.0.0 – 11.1.0 Fixed in — No fix listed CNA
  • typo3/cms-core (Packagist) Vendor— Affected 10.0.0 to before 10.4.14 Fixed in 10.4.14 Patch available GHSA-4p9g-qgx9-397p
  • typo3/cms-core (Packagist) Vendor— Affected 11.0.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-4p9g-qgx9-397p
  • typo3/cms-core (Packagist) Vendor— Affected 9.0.0 to before 9.5.25 Fixed in 9.5.25 Patch available GHSA-4p9g-qgx9-397p
  • typo3/cms (Packagist) Vendor— Affected 10.0.0 to before 10.4.14 Fixed in 10.4.14 Patch available GHSA-4p9g-qgx9-397p
  • typo3/cms (Packagist) Vendor— Affected 11.0.0 to before 11.1.1 Fixed in 11.1.1 Patch available GHSA-4p9g-qgx9-397p
  • typo3/cms (Packagist) Vendor— Affected 9.0.0 to before 9.5.25 Fixed in 9.5.25 Patch available GHSA-4p9g-qgx9-397p

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*9.0.0 to before 9.5.25; 10.0.0 to before 10.4.14; 11.0.0 to before 11.1.1VulnerableTYPO3
  • cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:* Versions 9.0.0 to before 9.5.25; 10.0.0 to before 10.4.14; 11.0.0 to before 11.1.1 Vulnerable ·TYPO3

Remediation

  • Fix · GHSA-4p9g-qgx9-397p typo3/cms-core (Packagist) Fixed in 10.4.14 Advisory →
  • Fix · GHSA-4p9g-qgx9-397p typo3/cms-core (Packagist) Fixed in 11.1.1 Advisory →
  • Fix · GHSA-4p9g-qgx9-397p typo3/cms-core (Packagist) Fixed in 9.5.25 Advisory →
  • Fix · GHSA-4p9g-qgx9-397p typo3/cms (Packagist) Fixed in 10.4.14 Advisory →
  • Fix · GHSA-4p9g-qgx9-397p typo3/cms (Packagist) Fixed in 11.1.1 Advisory →
  • Fix · GHSA-4p9g-qgx9-397p typo3/cms (Packagist) Fixed in 9.5.25 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21359
  2. 2026-10-03 Alias added: GHSA-4p9g-qgx9-397p

References

Advisory 4

Other 2

  • TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
  • TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
  • TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
  • TI-2009-00241 The Indexed Search Engine (indexed_search) system extension in TYPO3 4.0.0 through 4.0.9… CVSS 2.0HIGH 10.0
  • TI-2020-08940 Improperly Controlled Modification of Dynamically-Determined Object Attributes in TYPO3 CMS CVSS 3.1CRITICAL 10.0
  • TI-2011-03994 Improper authentication in TYPO3 CVSS 3.1CRITICAL 9.8
See all 217 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences