A krb5 security update has been released for CentOS 7.

CESA-2021:4788 Moderate CentOS 7 krb5 Security Update

CentOS Errata and Security Advisory 2021:4788 Moderate

Upstream details at :   https://access.redhat.com/errata/RHSA-2021:4788

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

x86_64:
ebe9101eafa195e97d5191257396d826d54a03212851b56130c2502068cb8f4c krb5-devel-1.15.1-51.el7_9.i686.rpm
7bddd4fb53bfa9c6ecfb51584e6173525154d1432fdd23c18162b8a5428fd9c2 krb5-devel-1.15.1-51.el7_9.x86_64.rpm
56773da33ba948469db1f7ab9d9bc267d2e29b3458b2d1376573c09525ad4581 krb5-libs-1.15.1-51.el7_9.i686.rpm
03cf1dde125c19d5d48038e69f3552a4973548aa09dc383debd850eec84fa1a4 krb5-libs-1.15.1-51.el7_9.x86_64.rpm
82f169e42c36e9579026a6d56d46f2cbe59221a611192fe96b613ff527e57a1c krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm
9d8090a78aa40baa54d3800a01ae8e374a61c7be5587eb90bc2cf279a1c29e2e krb5-server-1.15.1-51.el7_9.x86_64.rpm
87aee3a9528b247730a778c50eab6e97da58d331049a063fa5f651d993db29d5 krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm
249e4941a5a5071a668ba290a7dc5e28013fd43206a9a9b2a2a236220aee04dd krb5-workstation-1.15.1-51.el7_9.x86_64.rpm
ca2534fe257e28c069b648a161fddd50d841f1df267a98ca33d8ceea488d83c7 libkadm5-1.15.1-51.el7_9.i686.rpm
2d79f11c74a72adcef4f3407e674947b25332958c8d3722a976ffc2d712fb812 libkadm5-1.15.1-51.el7_9.x86_64.rpm

Source:
4ee6bbb03ad07c96f8be5eff2b969c4047aa54e62cdd5c972e88cac0a3340e8b krb5-1.15.1-51.el7_9.src.rpm