A dhcp security update has been released for CentOS 7.

CESA-2021:2357 Important CentOS 7 dhcp Security Update

CentOS Errata and Security Advisory 2021:2357 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2021:2357

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
33fa2846ccf25385f17ff97c1999aeae26f83868dcd26164e5524c4255cb1ce1 dhclient-4.2.5-83.el7.centos.1.x86_64.rpm
2d5e71a837c196e47d9d4ea6dfd48be8ec78faaf662f54465992a8340399b0cc dhcp-4.2.5-83.el7.centos.1.x86_64.rpm
33747e3cee335e0df270058b70d2ce33f91cadb372c26e1a24641083294b45b2 dhcp-common-4.2.5-83.el7.centos.1.x86_64.rpm
b1b8c61d7f414e0bff5b987279a268865b3400e4618cc614c0e2852dd52aef50 dhcp-devel-4.2.5-83.el7.centos.1.i686.rpm
30c56f4f794204c049aed74f749c3b0b0739f232b66c48497f125252af988405 dhcp-devel-4.2.5-83.el7.centos.1.x86_64.rpm
7f4ef7b8732bcac3d9fd39fa13b53c8401e618cc64cf7e86b46a6a0bf9f5ae93 dhcp-libs-4.2.5-83.el7.centos.1.i686.rpm
4bfbeb71cf3639c4f6067ddf6c491f06976bc93d091646bb825481dd641a719f dhcp-libs-4.2.5-83.el7.centos.1.x86_64.rpm

Source:
1a4e4954a65fca1e126414fc8ddfb219f0e2c23ff2502fbb5deb02b91dd5ec18 dhcp-4.2.5-83.el7.centos.1.src.rpm