Statistically, no. The risk of rootkits, cryptominers, and backdoored SSH daemons is extremely high. Only use official sources.

Before we discuss how to download, you must understand Red Hat’s business model. RHEL is not free open-source software in the gratis sense—it is free in the libre sense (you have rights to the source code) but not necessarily cost-free.

Red Hat sells subscriptions. A subscription provides:

Without an active subscription, you cannot legally download the official RHEL 7.3 ISO from Red Hat. Third-party websites claiming to host the ISO are often illegal, outdated, pre-hacked, or filled with malware.

Warning: Downloading RHEL ISOs from torrents or random file hosting sites violates Red Hat’s trademark and subscription agreements. Furthermore, you risk installing a backdoored OS in your production environment.

There are two primary methods to obtain the RHEL 7.3 ISO, depending on your subscription status.

Red Hat Enterprise Linux (RHEL) 7.3, released in November 2016, introduced enhanced security, improved performance for containers, and better manageability for large-scale deployments. While it is now considered a legacy release (the latest in the RHEL 7 series is 7.9), some enterprises still need it for application compatibility or legacy system maintenance.

If you require the RHEL 7.3 ISO image, follow this guide. Important: You cannot download RHEL ISOs directly from public mirrors without a subscription. All downloads are gated through the Red Hat Customer Portal.

A simple Google search for "RHEL 7.3 ISO" will likely return results from unofficial mirror sites, torrent trackers, or file-hosting services.