If you are connected to the internet, running this image is a security gamble. You are relying on network segmentation (firewalls, ACLs) to protect management interfaces, because the code itself is frozen in time.
The 3.6.E (15.2(2)E) train has largely reached its end-of-maintenance milestones. Cisco typically stops providing bug fixes for these older versions after several years, though critical security vulnerabilities may be addressed for a longer period. For the most up-to-date and secure environment, Cisco often suggests moving to the Cisco IOS XE Everest (16.x) Gibraltar (16.12.x) step-by-step commands to upgrade your Catalyst switch using this file in Install Mode
