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CVE-2021-41114

4.8 · MEDIUM

TYPO3 is an open source PHP based web content management system released under the GNU GPL.

Published Oct 5, 2021CWE-20EPSS 1.22%

Overview

CVE-2021-41114 is a medium-severity vulnerability. It was published on October 5, 2021 and has a CVSS 3.1 base score of 4.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that TYPO3 CMS is susceptible to host spoofing due to improper validation of the HTTP Host header. TYPO3 uses the HTTP Host header, for example, to generate absolute URLs during the frontend rendering process. Since the host header itself is provided by the client, it can be forged to any value, even in a name-based virtual hosts environment. This vulnerability is the same as described in TYPO3-CORE-SA-2014-001 (CVE-2014-3941). A regression, introduced during TYPO3 v11 development, led to this situation. The already existing setting $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] (used as an effective mitigation strategy in previous TYPO3 versions) was not evaluated anymore, and reintroduced the vulnerability.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4GitHubgithub.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphmReftypo3.org/security/advisory/typo3-core-sa-2021-015GitHubgithub.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4GitHubgithub.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphmReftypo3.org/security/advisory/typo3-core-sa-2021-015

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41114?

CVE-2021-41114 is a medium-severity vulnerability. It was published on October 5, 2021 and has a CVSS 3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2021-41114?

This vulnerability has a CVSS 3.1 base score of 4.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-41114?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41114?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41114 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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