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Vulnerability details: VCID-hn17-q49v-qffj
Vulnerability ID VCID-hn17-q49v-qffj
Aliases CVE-2021-41114
GHSA-m2jh-fxw4-gphm
Summary HTTP Host Header Injection ### 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
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-20 Improper Input Validation
CWE-644 Improper Neutralization of HTTP Headers for Scripting Syntax
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00289 https://api.first.org/data/v1/epss?cve=CVE-2021-41114
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-m2jh-fxw4-gphm
cvssv3.1 4.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-41114.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-41114.yaml
cvssv3.1 4.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-41114.yaml
generic_textual MODERATE https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-41114.yaml
cvssv3.1 4.8 https://github.com/TYPO3/typo3
generic_textual MODERATE https://github.com/TYPO3/typo3
cvssv3.1 4.8 https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
generic_textual MODERATE https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
cvssv3.1 4.8 https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
cvssv3.1_qr MODERATE https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
generic_textual MODERATE https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
cvssv3.1 4.8 https://nvd.nist.gov/vuln/detail/CVE-2014-3941
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2014-3941
cvssv3.1 4.8 https://nvd.nist.gov/vuln/detail/CVE-2021-41114
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2021-41114
cvssv3.1 4.8 https://typo3.org/security/advisory/typo3-core-sa-2021-015
generic_textual MODERATE https://typo3.org/security/advisory/typo3-core-sa-2021-015
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-41114
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-41114.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-41114.yaml
https://github.com/TYPO3/typo3
https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
https://nvd.nist.gov/vuln/detail/CVE-2014-3941
https://nvd.nist.gov/vuln/detail/CVE-2021-41114
https://typo3.org/security/advisory/typo3-core-sa-2021-015
GHSA-m2jh-fxw4-gphm https://github.com/advisories/GHSA-m2jh-fxw4-gphm
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-41114.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-41114.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://github.com/TYPO3/typo3
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2014-3941
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2021-41114
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Found at https://typo3.org/security/advisory/typo3-core-sa-2021-015
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

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Exploit Prediction Scoring System (EPSS)
Percentile 0.51927
EPSS Score 0.00289
Published At June 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-01T12:17:38.657552+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/10/GHSA-m2jh-fxw4-gphm/GHSA-m2jh-fxw4-gphm.json 36.1.3