The Apache Struts REST Plugin is using XStream library which is vulnerable and allow perform a DoS attack when using a malicious request with specially crafted XML payload. Upgrade to the Apache Struts version 2.5.16 and switch to an optional Jackson XML handler as described here http://struts.apache.org/plugins/rest/#custom-contenttypehandlers. Another option is to implement a custom XML handler based on the Jackson XML handler from the Apache Struts 2.5.16.
{
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*"
],
"extracted_events": [
{
"range": [
{
"introduced": "2.1.1"
},
{
"last_affected": "2.5.14.1"
}
],
"source": "CPE_RANGE"
}
],
"vendor_product": "apache:struts"
}
]
}