The Cisco Secure Firewall ASA Virtual (ASAv) brings the full suite of Cisco ASA firewall and VPN capabilities to virtualized environments, ensuring consistent security across physical and virtual data centers . You can download the software directly from the Cisco Software Central
To download the Cisco Adaptive Security Virtual Appliance (ASAv) software, you must access the Cisco Software Central
Additionally, never expose your ASAv’s management interface (Management 0/0) to the public internet. Many users download the software, deploy it to a public cloud, and forget to set an ACL—leading to rapid compromise.