A firewalld security update has been released for CentOS 7.

CentOS Errata and Bugfix Advisory 2020:0835

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:0835

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

x86_64:
f2d7f12e59c703b6614f8e8190d2e3980b40f3104795464f1043bdce56f657b5 firewall-applet-0.6.3-2.el7_7.4.noarch.rpm
37dd17b15463d74fe6ccd8f026a917a5bb8738fbf7c84cf74ab74c4bd5f6fb67 firewall-config-0.6.3-2.el7_7.4.noarch.rpm
f51ed05c65cf3960d4fd0c582dbcc40af18474aada0d2f86245244afd5679e98 firewalld-0.6.3-2.el7_7.4.noarch.rpm
540954df8fd400c2af35a2b128cd57f76486837e4f3fcdf610b8c26c2493e307 firewalld-filesystem-0.6.3-2.el7_7.4.noarch.rpm
15ddbf1f3b7096d3590a25f1e525b0fec51ecaf9ba801351f0f31af52612d8a9 python-firewall-0.6.3-2.el7_7.4.noarch.rpm

Source:
218537c62735521cecd60c84a35682e84f69c21b0b5cff0e7f41fc1fe6d49d08 firewalld-0.6.3-2.el7_7.4.src.rpm