Q. We are being asked by the system owner/hosting operation to reach out to our software vendors to find out if their products may be vulnerable to the recently reported Apache Log4J compromise (CVE-2021-44228). 

A. None of the ActivePDF products use log4j. 

ActivePDF products are not affected by the log4j vulnerability. We do not use log4j within our source and have verified through scans that there are not any hidden dependencies on log4j.