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.
problem types: A regular expression Denial of Service when using URLValidator (similar to S2-044 & S2-047)
affected:
{
product: Apache Struts
vendor: Apache Software Foundation
versions:
status: affected, version: 2.3.7 - 2.3.33
status: affected, version: 2.5 - 2.5.12
}