Vulnerability in TYPO3
CVE-2021-21359
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- TYPO3
- TYPO3 Typo3.cms — versions >= 9.0.0, <= 9.5.24, >= 10.0.0, <= 10.4.13, >= 11.0.0, <= 11.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- packagist.org/packages/typo3/cms-core (Third Party Advisory, Release Notes)
- github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-4p9g-qgx9-397p (Third Party Advisory)
- typo3.org/security/advisory/typo3-core-sa-2021-005 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-21359?
- CVE-2021-21359 is a medium-severity vulnerability in TYPO3, classified under Asymmetric Resource Consumption (Amplification). CVSS score: 5.9/10. Published 2021-03-23.
- How severe is CVE-2021-21359?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2021-21359 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.