A web application running on the remote host uses a Java framework that is affected by multiple vulnerabilities.
The version of Apache Struts running on the remote host is 2.5.x prior to 184.108.40.206. It is, therefore, affected by an unspecified flaw that is triggered when parsing JSON. This allows a remote attacker to cause a denial of service. Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Upgrade to Apache Struts version 220.127.116.11 or later or apply the workaround as referenced in the vendor's security bulletin.