You have seen that the Integrated Cyber Defense Exchange (ICDx) collector for the Symantec Endpoint Protection Manager (SEPM) lists compatibility with 14.0.1 and 14.2, but you want to know about compatibility the new 14.3 release.
SEPM 14.3 RU1 has recently released.
SEPM 14.3 RU1
The ICDx versions 1.4.0 and 1.4.1 are the currently supported versions of the product and are not compatible with SEPM 14.3 RU1 by default. The upcoming ICDx 1.4.2 will be compatible with SEPM 14.3 RU1.
Until ICDx 1.4.2 is released, you can follow these steps to install the attached SEPM collector preview file for compatibility between ICDx and SEPM 14.3 RU1. See the attached preview file at the bottom of this page.
sudo -su icdx
$SYMC_HOMEdirectory set during installation.
tar -xzf sepm_col_dx-<version>.tar.gz -C $SYMC_HOME
$SYMC_HOME/launcher_dx-<version>/bin/launcher_dx -c $SYMC_HOME/sepm_col_dx-<version>/installer.json
The sepm_col_dx-3.7.20-843.tar.gz file is a temporary preview version of the collector that will be released in the next Integrated Cyber Defense Exchange product version release. This file is not meant to take the place of a full product version update when it is available.