How do I find what version of Log4J2 we have installed and after that, how do we upgrade it?
There is a zero-day flaw that needs patching:
FYI: Zero day for log4j versions: 2.0 <= Apache log4j <= 2.14.1 https://www.lunasec.io/docs/blog/log4j-zero-day/ patch: https://github.com/apache/logging-log4j2/releases/tag/log4j-2.15.0-rc1
Hello,
Have we got any more info on this and the impacts?
Please share if you have got any info on how to upgrade it to 2.15.
This is the latest update from Pega.
The latest from PEGA is on how to delete jars from database and update Pega_Stream, and that a hotfix is TBD 
Their recommendations are here: Pegasystems Documentation
As of today, the new version of log4j is actually 2.17.x