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For example, If you are upgrading from a pre-8.2 release, see the 8.2 release notes for downgrade issues after you upgrade the Phone Proxy and MTA instance, or for downgrade issues if you upgrade the activation key with new 8.2 features. Upgrading from some releases may have consequences for downgrading be sure to back up your configuration file in case you want to downgrade. If you are upgrading from a pre-8.3 release, see the Cisco ASA 5500 Migration Guide for Version 8.3 and Later for important information about migrating your configuration to Version 8.3 and later.
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Also, if you ever ran an earlier ASA version that had a vulnerable configuration, then regardless of the version you are currently running, you should verify that the portal customization was not compromised. See for details about the vulnerability and a list of fixed ASA versions.
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Cisco ASA Clientless SSL VPN Portal Customization Integrity Vulnerability-Multiple vulnerabilities have been fixed for clientless SSL VPN in ASA software, so you should upgrade your software to a fixed version.