The remote host is missing a critical Oracle Java SE patch update.
The Oracle Java SE installed on the remote host is a version prior to 7 Update 25 and is therefore affected by a flaw in the 'ObjectInputStream.readObject()' function that is triggered when deserializing Java Objects. This may allow a context-dependent attacker to execute arbitrary code. Oracle fixed this issue in Java SE 7u25 on 2013-06-18 and Java SE 8 on 2014-03-18, but did not disclose the vulnerability in the associated CPU. This issue was later found and disclosed on 2016-01-26, despite being silently patched years before.
Update to Java 1.7.0_25 (for JRE 7) or later.