4.x/BI360, Solver Private Host, and Solver Cloud are not impacted by the log4j exploit. Solver is built on a Microsoft .NET stack and does not currently utilize java components, which includes the log4j module. The Solver Cloud engineers have reviewed supporting systems within Solver, unrelated to Solver cloud, and have confirmed no mitigation steps are needed.
Apache Log4j Vulnerability Guidance: https://www.cisa.gov/uscert/apache-log4j-vulnerability-guidance