UnrealIRCd 4 EOL

UnrealIRCd 4 will be End Of Life on December 31, 2020. At that date all support and bugfixes, including security fixes, will stop.

You should upgrade to UnrealIRCd 5 somewhere in 2020. The EOL date of UnrealIRCd 4 gives you 12 months to do so, which should be ample time.