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Vulnerability record · CVE-2017-9804 · published 20 September 2017

CVE-2017-9804: Apache struts improper input validation vulnerability

Apache · Struts

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.

7.5 CVSS 3.0 High EPSS 8.2% · top 5.3% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
8.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-003.txt Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html PatchThird Party Advisory
http://www.securityfocus.com/bid/100612 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039261 Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20180629-0001/
https://struts.apache.org/docs/s2-050.html PatchVendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-struts2 Third Party Advisory
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-003.txt Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html PatchThird Party Advisory
http://www.securityfocus.com/bid/100612 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039261 Third Party AdvisoryVDB Entry
https://security.netapp.com/advisory/ntap-20180629-0001/
https://struts.apache.org/docs/s2-050.html PatchVendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-struts2 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-9804), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.