Description
TLDR: Apache Log4j 1.x does have vulnerabilities that are unpatched. Many configurations are not impacted by the vulnerabilities by default. Log4j 1.x is EOL so there are no fixed 1.x versions. You can patch the jar files yourself by removing the vulnerable class files. It's not a simple upgrade to go from Log4j 1.x to 2.x in most cases.
According to the statement above, we need to upgrade our current log4j version from v1.x to v2.x