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Servers and applications

CVE-2017-9804

In Apache Struts 2.3.7 through 2.3.33 and 2.5 through 2.5.12, if an application allows entering a URL in a form field and built-in URLValidator is used, it is possible to prepare a special URL which will be used to overload server process when performing validation of the URL. NOTE: this vulnerability exists because of an incomplete fix for S2-047 / CVE-2017-7672.

Severity
High 7.5
Published
20 Sept 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
8.2% in the next 30 daysHigher than 94% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
Apache StrutsServers and applications · cpe:a:apache:struts
  • Version 2.5.12
  • Version 2.5.10.1
  • Version 2.5.10
  • Version 2.5.9
All 55 release lines
  • Version 2.3.7
  • Version 2.3.8
  • Version 2.3.9
  • Version 2.3.10
  • Version 2.3.11
  • Version 2.3.12
  • Version 2.3.13
  • Version 2.3.14
  • Version 2.3.14.1
  • Version 2.3.14.2
  • Version 2.3.14.3
  • Version 2.3.15
  • Version 2.3.15.1
  • Version 2.3.15.2
  • Version 2.3.15.3
  • Version 2.3.16
  • Version 2.3.16.1
  • Version 2.3.16.2
  • Version 2.3.16.3
  • Version 2.3.17
  • Version 2.3.19
  • Version 2.3.20
  • Version 2.3.20.1
  • Version 2.3.20.2
  • Version 2.3.21
  • Version 2.3.22
  • Version 2.3.23
  • Version 2.3.24.2
  • Version 2.3.24.3
  • Version 2.3.25
  • Version 2.3.26
  • Version 2.3.27
  • Version 2.3.28
  • Version 2.3.28.1
  • Version 2.3.29
  • Version 2.3.30
  • Version 2.3.31
  • Version 2.3.32
  • Version 2.3.33
  • Version 2.5-beta1
  • Version 2.5-beta2
  • Version 2.5-beta3
  • Version 2.5
  • Version 2.5.1
  • Version 2.5.2
  • Version 2.5.3
  • Version 2.5.4
  • Version 2.5.5
  • Version 2.5.6
  • Version 2.5.7
  • Version 2.5.8
  • Version 2.5.9
  • Version 2.5.10
  • Version 2.5.10.1
  • Version 2.5.12

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-9804
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-9804