{"cve":"CVE-2016-8738","nvd":{"published":"2017-09-20T17:29:00.337","modified":"2026-06-17T00:54:55.010","status":"Modified","description":"In Apache Struts 2.5 through 2.5.5, if an application allows entering a URL in a form field and the 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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-20"],"references":["http://www.securityfocus.com/bid/94657","https://security.netapp.com/advisory/ntap-20180629-0003/","https://struts.apache.org/docs/s2-044.html","http://www.securityfocus.com/bid/94657","https://security.netapp.com/advisory/ntap-20180629-0003/"],"products":["apache:struts"],"source":"nvd","synced_at":"2026-10-19T20:46:01.145313090+00:00"},"epss":{"cve":"CVE-2016-8738","score":0.03259,"percentile":0.88369,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-86vq-8qhc-5rqw","url":"https://osv.dev/vulnerability/GHSA-86vq-8qhc-5rqw","summary":"Apache Struts vulnerable to possible DoS attack when using URLValidator","modified":"2024-02-19T05:37:33.721455Z","packages":[{"ecosystem":"Maven","name":"org.apache.struts:struts2-core","purl":"pkg:maven/org.apache.struts/struts2-core","ranges":[">=2.5.0 <2.5.13"],"fixed":["2.5.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}