As of 2025, 9.12.x is in End of Vulnerability/Security Support . Cisco recommends moving to 9.14.x or 9.18.x for new deployments. However, 9.12.4 remains available for download for existing contracts.
Get-FileHash -Algorithm SHA512 asa912-4-smp-k8.bin asa 9.12.4 download
While 9.12.4 is great today, be aware that Cisco has announced for the 9.12 train. You will stop receiving security patches for critical bugs eventually. As of 2025, 9
Downloading is often preferred over the initial 9.12.1 release because maintenance releases contain crucial bug fixes and security patches that stabilize the software for long-term deployment. As of 2025