A targetcli bugfix update has been released for CentOS 7.

CentOS-announce: CESA-2020:5434 Moderate CentOS 7 targetcli Security Update

CentOS Errata and Security Advisory 2020:5434 Moderate

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:5434

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

x86_64:
a5909e444b1d27c443afbbb9a2c128c3ee271e86aed9bea120cceb657e7bc326 targetcli-2.1.53-1.el7_9.noarch.rpm

Source:
3d9e97c3f67fa68079d62f5561f6f06c31673472f5ade5adc4781f3aa14dec5c targetcli-2.1.53-1.el7_9.src.rpm