It is a good practice to check periodically for new versions of Cisco IOS because of security vulnerabilities. To do it you can use
Cisco IOS Software Checker
On this page you just need to choose your IOS version, based on the output of the command:
show version
For instance: 15.2(4)M1
After this the wizard will show you the list of possible updates for your IOS. Next step is to get these updates. It is not so easy as with Microsoft or Linux, you can't just download them. The easiest way is to ask your Cisco supplier, they usually have access to all Cisco downloads.
Cisco IOS Software Checker
On this page you just need to choose your IOS version, based on the output of the command:
show version
For instance: 15.2(4)M1
After this the wizard will show you the list of possible updates for your IOS. Next step is to get these updates. It is not so easy as with Microsoft or Linux, you can't just download them. The easiest way is to ask your Cisco supplier, they usually have access to all Cisco downloads.
