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Vulnerability Details CVE-2021-21357

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 8.7.40, 9.5.25, 10.4.14, 11.1.1 due to improper input validation, attackers can by-pass restrictions of predefined options and submit arbitrary data in the Form Designer backend module of the Form Framework. In the default configuration of the Form Framework this allows attackers to explicitly allow arbitrary mime-types for file uploads - however, default _fileDenyPattern_ successfully blocked files like _.htaccess_ or _malicious.php_. Besides that, attackers can persist those files in any writable directory of the corresponding TYPO3 installation. A valid backend user account with access to the form module is needed to exploit this vulnerability. This is fixed in versions 8.7.40, 9.5.25, 10.4.14, 11.1.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.011
EPSS Ranking 77.0%
CVSS Severity
CVSS v3 Score 8.3
CVSS v2 Score 6.5
Products affected by CVE-2021-21357
  • Typo3 » Typo3 » Version: 10.0.0
    cpe:2.3:a:typo3:typo3:10.0.0
  • Typo3 » Typo3 » Version: 10.0.10
    cpe:2.3:a:typo3:typo3:10.0.10
  • Typo3 » Typo3 » Version: 10.0.9
    cpe:2.3:a:typo3:typo3:10.0.9
  • Typo3 » Typo3 » Version: 10.1.0
    cpe:2.3:a:typo3:typo3:10.1.0
  • Typo3 » Typo3 » Version: 10.2.0
    cpe:2.3:a:typo3:typo3:10.2.0
  • Typo3 » Typo3 » Version: 10.2.1
    cpe:2.3:a:typo3:typo3:10.2.1
  • Typo3 » Typo3 » Version: 10.2.2
    cpe:2.3:a:typo3:typo3:10.2.2
  • Typo3 » Typo3 » Version: 10.3.0
    cpe:2.3:a:typo3:typo3:10.3.0
  • Typo3 » Typo3 » Version: 10.4.0
    cpe:2.3:a:typo3:typo3:10.4.0
  • Typo3 » Typo3 » Version: 10.4.1
    cpe:2.3:a:typo3:typo3:10.4.1
  • Typo3 » Typo3 » Version: 10.4.10
    cpe:2.3:a:typo3:typo3:10.4.10
  • Typo3 » Typo3 » Version: 10.4.11
    cpe:2.3:a:typo3:typo3:10.4.11
  • Typo3 » Typo3 » Version: 10.4.12
    cpe:2.3:a:typo3:typo3:10.4.12
  • Typo3 » Typo3 » Version: 10.4.13
    cpe:2.3:a:typo3:typo3:10.4.13
  • Typo3 » Typo3 » Version: 10.4.2
    cpe:2.3:a:typo3:typo3:10.4.2
  • Typo3 » Typo3 » Version: 10.4.3
    cpe:2.3:a:typo3:typo3:10.4.3
  • Typo3 » Typo3 » Version: 10.4.4
    cpe:2.3:a:typo3:typo3:10.4.4
  • Typo3 » Typo3 » Version: 10.4.5
    cpe:2.3:a:typo3:typo3:10.4.5
  • Typo3 » Typo3 » Version: 10.4.6
    cpe:2.3:a:typo3:typo3:10.4.6
  • Typo3 » Typo3 » Version: 10.4.7
    cpe:2.3:a:typo3:typo3:10.4.7
  • Typo3 » Typo3 » Version: 10.4.8
    cpe:2.3:a:typo3:typo3:10.4.8
  • Typo3 » Typo3 » Version: 10.4.9
    cpe:2.3:a:typo3:typo3:10.4.9
  • Typo3 » Typo3 » Version: 11.0.0
    cpe:2.3:a:typo3:typo3:11.0.0
  • Typo3 » Typo3 » Version: 11.0.2
    cpe:2.3:a:typo3:typo3:11.0.2
  • Typo3 » Typo3 » Version: 11.0.3
    cpe:2.3:a:typo3:typo3:11.0.3
  • Typo3 » Typo3 » Version: 11.1.0
    cpe:2.3:a:typo3:typo3:11.1.0
  • Typo3 » Typo3 » Version: 8.0.0
    cpe:2.3:a:typo3:typo3:8.0.0
  • Typo3 » Typo3 » Version: 8.0.1
    cpe:2.3:a:typo3:typo3:8.0.1
  • Typo3 » Typo3 » Version: 8.0.7
    cpe:2.3:a:typo3:typo3:8.0.7
  • Typo3 » Typo3 » Version: 8.0.8
    cpe:2.3:a:typo3:typo3:8.0.8
  • Typo3 » Typo3 » Version: 8.1.0
    cpe:2.3:a:typo3:typo3:8.1.0
  • Typo3 » Typo3 » Version: 8.1.1
    cpe:2.3:a:typo3:typo3:8.1.1
  • Typo3 » Typo3 » Version: 8.1.2
    cpe:2.3:a:typo3:typo3:8.1.2
  • Typo3 » Typo3 » Version: 8.2.0
    cpe:2.3:a:typo3:typo3:8.2.0
  • Typo3 » Typo3 » Version: 8.2.1
    cpe:2.3:a:typo3:typo3:8.2.1
  • Typo3 » Typo3 » Version: 8.3.0
    cpe:2.3:a:typo3:typo3:8.3.0
  • Typo3 » Typo3 » Version: 8.3.1
    cpe:2.3:a:typo3:typo3:8.3.1
  • Typo3 » Typo3 » Version: 8.4.0
    cpe:2.3:a:typo3:typo3:8.4.0
  • Typo3 » Typo3 » Version: 8.4.1
    cpe:2.3:a:typo3:typo3:8.4.1
  • Typo3 » Typo3 » Version: 8.5.0
    cpe:2.3:a:typo3:typo3:8.5.0
  • Typo3 » Typo3 » Version: 8.5.1
    cpe:2.3:a:typo3:typo3:8.5.1
  • Typo3 » Typo3 » Version: 8.6.0
    cpe:2.3:a:typo3:typo3:8.6.0
  • Typo3 » Typo3 » Version: 8.6.1
    cpe:2.3:a:typo3:typo3:8.6.1
  • Typo3 » Typo3 » Version: 8.7.0
    cpe:2.3:a:typo3:typo3:8.7.0
  • Typo3 » Typo3 » Version: 8.7.1
    cpe:2.3:a:typo3:typo3:8.7.1
  • Typo3 » Typo3 » Version: 8.7.10
    cpe:2.3:a:typo3:typo3:8.7.10
  • Typo3 » Typo3 » Version: 8.7.11
    cpe:2.3:a:typo3:typo3:8.7.11
  • Typo3 » Typo3 » Version: 8.7.12
    cpe:2.3:a:typo3:typo3:8.7.12
  • Typo3 » Typo3 » Version: 8.7.13
    cpe:2.3:a:typo3:typo3:8.7.13
  • Typo3 » Typo3 » Version: 8.7.14
    cpe:2.3:a:typo3:typo3:8.7.14
  • Typo3 » Typo3 » Version: 8.7.15
    cpe:2.3:a:typo3:typo3:8.7.15
  • Typo3 » Typo3 » Version: 8.7.16
    cpe:2.3:a:typo3:typo3:8.7.16
  • Typo3 » Typo3 » Version: 8.7.17
    cpe:2.3:a:typo3:typo3:8.7.17
  • Typo3 » Typo3 » Version: 8.7.18
    cpe:2.3:a:typo3:typo3:8.7.18
  • Typo3 » Typo3 » Version: 8.7.19
    cpe:2.3:a:typo3:typo3:8.7.19
  • Typo3 » Typo3 » Version: 8.7.2
    cpe:2.3:a:typo3:typo3:8.7.2
  • Typo3 » Typo3 » Version: 8.7.20
    cpe:2.3:a:typo3:typo3:8.7.20
  • Typo3 » Typo3 » Version: 8.7.21
    cpe:2.3:a:typo3:typo3:8.7.21
  • Typo3 » Typo3 » Version: 8.7.22
    cpe:2.3:a:typo3:typo3:8.7.22
  • Typo3 » Typo3 » Version: 8.7.23
    cpe:2.3:a:typo3:typo3:8.7.23
  • Typo3 » Typo3 » Version: 8.7.24
    cpe:2.3:a:typo3:typo3:8.7.24
  • Typo3 » Typo3 » Version: 8.7.25
    cpe:2.3:a:typo3:typo3:8.7.25
  • Typo3 » Typo3 » Version: 8.7.26
    cpe:2.3:a:typo3:typo3:8.7.26
  • Typo3 » Typo3 » Version: 8.7.27
    cpe:2.3:a:typo3:typo3:8.7.27
  • Typo3 » Typo3 » Version: 8.7.28
    cpe:2.3:a:typo3:typo3:8.7.28
  • Typo3 » Typo3 » Version: 8.7.29
    cpe:2.3:a:typo3:typo3:8.7.29
  • Typo3 » Typo3 » Version: 8.7.3
    cpe:2.3:a:typo3:typo3:8.7.3
  • Typo3 » Typo3 » Version: 8.7.30
    cpe:2.3:a:typo3:typo3:8.7.30
  • Typo3 » Typo3 » Version: 8.7.31
    cpe:2.3:a:typo3:typo3:8.7.31
  • Typo3 » Typo3 » Version: 8.7.32
    cpe:2.3:a:typo3:typo3:8.7.32
  • Typo3 » Typo3 » Version: 8.7.38
    cpe:2.3:a:typo3:typo3:8.7.38
  • Typo3 » Typo3 » Version: 8.7.39
    cpe:2.3:a:typo3:typo3:8.7.39
  • Typo3 » Typo3 » Version: 8.7.4
    cpe:2.3:a:typo3:typo3:8.7.4
  • Typo3 » Typo3 » Version: 8.7.5
    cpe:2.3:a:typo3:typo3:8.7.5
  • Typo3 » Typo3 » Version: 8.7.6
    cpe:2.3:a:typo3:typo3:8.7.6
  • Typo3 » Typo3 » Version: 8.7.7
    cpe:2.3:a:typo3:typo3:8.7.7
  • Typo3 » Typo3 » Version: 8.7.8
    cpe:2.3:a:typo3:typo3:8.7.8
  • Typo3 » Typo3 » Version: 8.7.9
    cpe:2.3:a:typo3:typo3:8.7.9
  • Typo3 » Typo3 » Version: 9.0.0
    cpe:2.3:a:typo3:typo3:9.0.0
  • Typo3 » Typo3 » Version: 9.0.3
    cpe:2.3:a:typo3:typo3:9.0.3
  • Typo3 » Typo3 » Version: 9.0.4
    cpe:2.3:a:typo3:typo3:9.0.4
  • Typo3 » Typo3 » Version: 9.1.0
    cpe:2.3:a:typo3:typo3:9.1.0
  • Typo3 » Typo3 » Version: 9.1.2
    cpe:2.3:a:typo3:typo3:9.1.2
  • Typo3 » Typo3 » Version: 9.1.3
    cpe:2.3:a:typo3:typo3:9.1.3
  • Typo3 » Typo3 » Version: 9.2.0
    cpe:2.3:a:typo3:typo3:9.2.0
  • Typo3 » Typo3 » Version: 9.2.1
    cpe:2.3:a:typo3:typo3:9.2.1
  • Typo3 » Typo3 » Version: 9.3.0
    cpe:2.3:a:typo3:typo3:9.3.0
  • Typo3 » Typo3 » Version: 9.3.1
    cpe:2.3:a:typo3:typo3:9.3.1
  • Typo3 » Typo3 » Version: 9.3.2
    cpe:2.3:a:typo3:typo3:9.3.2
  • Typo3 » Typo3 » Version: 9.3.3
    cpe:2.3:a:typo3:typo3:9.3.3
  • Typo3 » Typo3 » Version: 9.4.0
    cpe:2.3:a:typo3:typo3:9.4.0
  • Typo3 » Typo3 » Version: 9.5.0
    cpe:2.3:a:typo3:typo3:9.5.0
  • Typo3 » Typo3 » Version: 9.5.1
    cpe:2.3:a:typo3:typo3:9.5.1
  • Typo3 » Typo3 » Version: 9.5.10
    cpe:2.3:a:typo3:typo3:9.5.10
  • Typo3 » Typo3 » Version: 9.5.11
    cpe:2.3:a:typo3:typo3:9.5.11
  • Typo3 » Typo3 » Version: 9.5.12
    cpe:2.3:a:typo3:typo3:9.5.12
  • Typo3 » Typo3 » Version: 9.5.13
    cpe:2.3:a:typo3:typo3:9.5.13
  • Typo3 » Typo3 » Version: 9.5.14
    cpe:2.3:a:typo3:typo3:9.5.14
  • Typo3 » Typo3 » Version: 9.5.15
    cpe:2.3:a:typo3:typo3:9.5.15
  • Typo3 » Typo3 » Version: 9.5.16
    cpe:2.3:a:typo3:typo3:9.5.16
  • Typo3 » Typo3 » Version: 9.5.17
    cpe:2.3:a:typo3:typo3:9.5.17
  • Typo3 » Typo3 » Version: 9.5.18
    cpe:2.3:a:typo3:typo3:9.5.18
  • Typo3 » Typo3 » Version: 9.5.19
    cpe:2.3:a:typo3:typo3:9.5.19
  • Typo3 » Typo3 » Version: 9.5.2
    cpe:2.3:a:typo3:typo3:9.5.2
  • Typo3 » Typo3 » Version: 9.5.20
    cpe:2.3:a:typo3:typo3:9.5.20
  • Typo3 » Typo3 » Version: 9.5.21
    cpe:2.3:a:typo3:typo3:9.5.21
  • Typo3 » Typo3 » Version: 9.5.22
    cpe:2.3:a:typo3:typo3:9.5.22
  • Typo3 » Typo3 » Version: 9.5.23
    cpe:2.3:a:typo3:typo3:9.5.23
  • Typo3 » Typo3 » Version: 9.5.24
    cpe:2.3:a:typo3:typo3:9.5.24
  • Typo3 » Typo3 » Version: 9.5.3
    cpe:2.3:a:typo3:typo3:9.5.3
  • Typo3 » Typo3 » Version: 9.5.4
    cpe:2.3:a:typo3:typo3:9.5.4
  • Typo3 » Typo3 » Version: 9.5.5
    cpe:2.3:a:typo3:typo3:9.5.5
  • Typo3 » Typo3 » Version: 9.5.6
    cpe:2.3:a:typo3:typo3:9.5.6
  • Typo3 » Typo3 » Version: 9.5.7
    cpe:2.3:a:typo3:typo3:9.5.7
  • Typo3 » Typo3 » Version: 9.5.8
    cpe:2.3:a:typo3:typo3:9.5.8
  • Typo3 » Typo3 » Version: 9.5.9
    cpe:2.3:a:typo3:typo3:9.5.9


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