CVE-2021-41114
HTTP Host Header Injection
Description
### Meta * CVSS: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C` (3.5) ### Problem 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)](https://typo3.org/security/advisory/typo3-core-sa-2014-001/). 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. ### Solution Update your instance to TYPO3 version 11.5.0 which addresses the problem described. ### Credits Thanks to TYPO3 framework merger Benjamin Franzke who reported and fixed the issue. ### References * [TYPO3-CORE-SA-2021-015](https://typo3.org/security/advisory/typo3-core-sa-2021-015) * [CVE-2014-3941](https://nvd.nist.gov/vuln/detail/CVE-2014-3941) reintroduced in TYPO3 v11.0.0
How to fix CVE-2021-41114
To remediate CVE-2021-41114, upgrade the affected package to a fixed version below.
- —upgrade to 11.5.0 or later
- —upgrade to 11.5.0 or later
- —upgrade to 11.5.0 or later
Is CVE-2021-41114 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.