CVE-2017-9804: Apache Struts

High severity, CVSS 7.5. EPSS: 8.2% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Struts: version 2.3.7 only; version 2.3.8 only; version 2.3.9 only; version 2.3.10 only; version 2.3.11 only; version 2.3.12 only; …

Published 2017-09-20. Last modified 2026-06-17.