A new dhcp package with the fix for the CVE-2021-25217 within CentOS 6 extended lifecycle support has been scheduled for gradual rollout from our production repository.
Rollout slot: 2
Rolled out to: 1%
ETA for 100% rollout: June, 7
yum update dhcp*
yum update dhcp* --enablerepo=ELS6-rollout-2-bypass