You'll need to open a support case, and we can send you the temp admin password.
http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/117866-configure-esa-00.html
Instructions
Follow these steps in order to reset your admin password on your Cisco content security appliance.
- Contact Customer Support for a temporary admin password. You need to provide the serial number of the appliance.
- When you receive the temporary admin password, access the appliance via a serial connection:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow control: Hardware
- Log in as user adminpassword.
- Enter the temporary admin password that you received from the Customer Support Engineer and press Return.
- Enter the new password that will be used for the admin user.
AsyncOS myesa.local (ttyv0)
login: adminpassword
Password: <<<WILL REMAIN BLANK AS YOU ENTER IN THE TEMP PASSWORD>>>
Last login: Fri Feb 6 20:45 from 192.168.0.01
Copyright (c) 2001-2013, Cisco Systems, Inc.
AsyncOS 8.5.6 for Cisco C370 build 092
Welcome to the Cisco C370 Email Security Appliance
Chaning local password for admin
New Password: <<<WILL REMAIN BLANK AS YOU ENTER IN THE NEW PASSWORD>>>
Retype New Password: <<<WILL REMAIN BLANK AS YOU ENTER IN THE NEW PASSWORD>>>
AsyncOS myesa.local (ttyv0)
login: admin
Password: <<<USE NEW PASSWORD AS SET ABOVE>>>
-Robert