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You are here: Home / Cisco ASA General / Password Recovery for the Cisco ASA 5500 Firewall (5505,5510,5520 etc)

Password Recovery for the Cisco ASA 5500 Firewall (5505,5510,5520 etc)

Written By Harris Andrea

If you have lost the administrator password to access the security appliance you can recover the ASA password with the following steps:

password recovery on cisco asa

Recovering your Password on Cisco ASA

Step1: Connect to the firewall using a console cable

Step2: Power cycle the appliance (power off and then on)

Step3: Press the Escape key to enter ROMMON mode

Step4: Use confreg command to change the configuration register to 0x41

rommon #1> confreg 0x41

Step5:  Configure the security appliance to ignore the startup configuration.

rommon #2> confreg

The ASA firewall will display the current configuration register value and boot parameters and ask you if you want to change them

Current Configuration Register: 0x00000041

Configuration Summary:

boot default image from Flash

ignore system configuration

Do you wish to change this configuration? y/n [n]: y

Step6: At the prompt enter Y to change the parameters.

Step7: Accept the default values for all settings (at the prompt enter Y)

MORE READING:  Cisco ASA 5505-5510-5520-5540-5550-5580 Performance Throughput and Specs

Step8: Reload the ASA appliance by entering the following command

rommon #3> boot

The firewall will reboot and load the default configuration instead of the startup configuration.

Step9:   Enter into EXEC mode

hostname> enable

When prompted for the password, press Enter (the password in blank now)

Step 10: Access the global configuration mode and change the passwords as required:

hostname# configure terminal
hostname(config)# password password
hostname(config)# enable password password
hostname(config)# username name password password

Step 11: Load the default configuration register value (0x1) by entering the following command:

hostname(config)# no config-register

Step 12: Save the new passwords to the startup configuration by entering the following command:

hostname(config)# copy running-config startup-config

The above works for all ASA models such as 5505, 5510, 5520 etc 

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  • Cisco ASA Firewall (5500 and 5500-X) Security Levels Explained
  • Cisco ASA 5505-5510-5520-5540-5550-5580 Performance Throughput and Specs
  • Cisco ASA 5505, 5510 Base Vs Security Plus License Explained

Filed Under: Cisco ASA General

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About Harris Andrea

Harris Andrea is an Engineer with more than two decades of professional experience in the fields of TCP/IP Networks, Information Security and I.T. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc.

He is a self-published author of two books ("Cisco ASA Firewall Fundamentals" and "Cisco VPN Configuration Guide") which are available at Amazon and on this website as well.

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