HOMEVULNERABILITIESCVE-2017-14251
HIGH

CVE-2017-14251

CWE-434Published: September 11, 2017· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

Unrestricted File Upload vulnerability in the fileDenyPattern in sysext/core/Classes/Core/SystemEnvironmentBuilder.php in TYPO3 7.6.0 to 7.6.21 and 8.0.0 to 8.7.4 allows remote authenticated users to upload files with a .pht extension and consequently execute arbitrary PHP code.

NVD Source

Technical Analysis

CVE-2017-14251 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

typo31 product(s)
typo3
Source: NVD CPE · 42 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

ADVISORYhttp://www.securityfocus.com/bid/100620
ADVISORYhttp://www.securitytracker.com/id/1039295
ADVISORYhttps://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007/
ADVISORYhttp://www.securityfocus.com/bid/100620
ADVISORYhttp://www.securitytracker.com/id/1039295
ADVISORYhttps://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007/

All References (8)

→
http://blog.emaze.net/2017/12/typo3-unrestricted-file-upload-remote.html
→
http://www.securityfocus.com/bid/100620Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1039295Third Party Advisory · VDB Entry
→
https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007/Exploit · Vendor Advisory
→
http://blog.emaze.net/2017/12/typo3-unrestricted-file-upload-remote.html
→
http://www.securityfocus.com/bid/100620Third Party Advisory · VDB Entry
→
http://www.securitytracker.com/id/1039295Third Party Advisory · VDB Entry
→
https://typo3.org/teams/security/security-bulletins/typo3-core/typo3-core-sa-2017-007/Exploit · Vendor Advisory

Quick Facts

CVE IDCVE-2017-14251
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-434
CISA KEVNo
Affected1 vendor(s)
PublishedSep 11, 2017

Related CVEs (CWE-434)

CVE-2025-60219
10.0
CVE-2025-60207
10.0
CVE-2025-48148
10.0
CVE-2025-49387
10.0
CVE-2025-60235
10.0
CVE-2025-58963
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2017-14251 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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