Download Firmware Cisco ESA AsyncOS 12.1

Cisco has released a firmware update for its Email Security Appliance‘s, which are abbreviated to ESA. The technology comes from IronPort Systems, which was bought by Cisco in 2007, although that was already a decade ago, you can still hear the name IronPort for these appliances. For the supported upgrade paths it is recommended to read the documentation or contact Cisco’s TAC. This firmware is called 12.1 and has 12.1.0-071 as the exact version number. The list of updates for 12.1 looks like this:

What’s New In This Release

• Intelligent Multi-Scan Enhancement – Intelligent Multi-Scan (IMS) is a high performing multi-layer anti-spam solution. Cisco Email Security appliance provides an updated IMS engine with this release. This engine has a different combination of anti-spam engines that can increase the spam catch rates. To use the updated IMS engine, you must add the IMS feature key and accept the license in your appliance. For the existing IMS users, all the mail policies for IMS are migrated to work seamlessly with the updated IMS engine.
• Minimum Scores for Entity-based Rules of Custom Classifiers for Custom DLP Policies – You can now use the recommended minimum scores or choose to override the minimum score for entity-based rules, when you create custom classifiers for custom DLP policies. You can use the minimum score for an entity-based rule instead of the configured weight of the rule. The minimum score differentiates the partial and the full matches, and calculates the score accordingly. This helps in reducing the number of false positives and false negatives.
  To configure the minimum score:
  Go to Mail Policies > DLP Policy Customizations > Custom Classifiers Settings section and select the Use recommended minimum scores for entity-based rules check box.
  Go to Mail Policies > DLP Policy Customizations > Add Custom Classifier (or review an existing custom classifier) ​​and enter the minimum score.
  For more information, see the “Data Loss Prevention” chapter in the user guide.

Changes in Behavior

• SSL Configuration Changes – After you upgrade to this release, you cannot enable TLS v1.0 and v1.2 methods simultaneously. However, you can enable these methods in conjunction with the TLS v.1.1 method, when you configure SSL settings.