HOMEVULNERABILITIESCVE-2021-41114
MEDIUM

CVE-2021-41114

CWE-20Published: October 5, 2021· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-41114 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

typo31 product(s)
typo3
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
PATCHhttps://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
ADVISORYhttps://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
ADVISORYhttps://typo3.org/security/advisory/typo3-core-sa-2021-015
ADVISORYhttps://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
ADVISORYhttps://typo3.org/security/advisory/typo3-core-sa-2021-015

All References (6)

→
https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4Patch · Third Party Advisory
→
https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphmThird Party Advisory
→
https://typo3.org/security/advisory/typo3-core-sa-2021-015Vendor Advisory
→
https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4Patch · Third Party Advisory
→
https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphmThird Party Advisory
→
https://typo3.org/security/advisory/typo3-core-sa-2021-015Vendor Advisory

Quick Facts

CVE IDCVE-2021-41114
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedOct 5, 2021

Related CVEs (CWE-20)

CVE-2026-48281
10.0
CVE-2026-48316
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CVE-2026-33587
10.0
CVE-2011-4755
10.0
CVE-2026-48277
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CVE-2026-47928
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-41114 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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