PCI-DSS, HIPAA, and SOC2 audits explicitly require supported, patched software. Running ACS 4.2 will result in a .
Some old gear only talks via TACACS+ protocols that modern servers might struggle to support without specific "legacy" tweaks. cisco acs 4.2 software download
is the modern, fully supported AAA/Policy platform. It replaces ACS entirely. is the modern, fully supported AAA/Policy platform
Cisco Partners can sometimes access the "Legacy Software" section of the Partner Hub, but ACS 4.2 was purged from most mirrors after 2020. Very few partners retain copies. Very few partners retain copies
Instead of chasing an obsolete, dangerous download, migrate to one of these modern solutions.
If your company still pays SmartNet on an old Cisco 1120 or 1113 ACS appliance, Cisco support might provide the software for disaster recovery. Contact the Cisco Global Licensing Team via a TAC case. You will need the Product ID (e.g., ACS-1120-K9) and your service contract number.