: To download legacy software, your Cisco account must be associated with an active Service Contract (SmartNet) that includes ACS 5.x entitlements. Security Warning
While third-party forums or torrent sites may host older ISO files, these are not verified by Cisco and may contain security vulnerabilities or malicious code. For lab environments, some users previously obtained from the Cisco License Portal, but these often still require the software image from a contract-linked account. cisco acs 55 iso download updated
Cisco Secure ACS 5.5 is currently and obsolete , meaning the ISO is no longer available for official download from the Cisco website . Cisco's policy for retired security products involves removing documentation and downloads to prevent the use of software that is highly susceptible to security vulnerabilities. Key Status Updates (April 2026) : To download legacy software, your Cisco account