Java FTP client libraries try to understand and auto-detect as many formats as possible. In addition, they offer various alternatives for handling unexpected format answers: ...

As discussed in my previous JavaWorld article “Java FTP Client Libraries Reviewed” (April 2003), FTP support in the JDK does not fully implement the FTP specification (Request for Comments 959).

Systems and services that use the Java logging library, Apache Log4j between versions 2.0 and 2.14.1 are all affected, including many services and applications written in Java.