A crafted JSON request can be used to perform a DoS attack when using the Struts REST plugin
Who should read this
All Struts 2 developers and users which are using the REST plugin
Impact of vulnerability
A DoS attack is possible when using outdated json-lib with the Struts REST plugin
Maximum security rating
Upgrade to Struts 18.104.22.168
Struts 2.5 - Struts 2.5.14
Huijun Chen, XiaoLong Zhu - Huawei Technologies
The REST Plugin is using an outdated JSON-lib library which is vulnerable and allow perform a DoS attack using malicious request with specially crafted JSON payload.
Use Jackson handler instead of the default JSON-lib handler as described here.