I see you already found a newer version. Nearly all the many vulnerabilities it has had over the past decade don't provide privileged access nor compromise the system beyond just crashing named. Maybe some of your clients can be prompted to query your named for known queries that can crash it. In some cases it can be trivial.
echo "qvt -p punbf -g gkg nhgubef.ovaq @fson.faf-co.vfp.bet.|terc Errq" |\ tr "Enopqrstuvabcefghk" "Rabcdefghinoprstux"
