I have a 1601R router considering that the router has reached its end of life for support and software upgrade it has been suggested that I replace the router with an 1841. I am currently running ISO 12.0. From what I understand I can upgrade to Cisco IOS Software Release 12.1(3)XG. Is it a security risk to run an older version of the IOS?
There is no inherent security risk with running an older version. If the IOS is working well, there should be no reason to upgrade. However, you should use the Cisco Bug tool to determine if there are any bugs within your current release that affect the features you use. If that is the case, you may want to upgrade. Also, Cisco will defer releases from time to time if there are security issues with them. You can use the Cisco Software Advisor to determine if that is the case for your release.
I would answer this question slightly differently. Cisco publishes Security Advisories when it discovers that there is a security threat that affects Cisco equipment, including the router product line. There are many vulnerabilities that affect various older versions of code. This link goes to the page that lists the advisories:
If you are thinking about running older code then I would suggest that you examine this list carefully to see if the version you are thinking about has some security vulnerabilities. For example this link:
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