I have a couple of customers who still use the old discontinued/obsolete IPSEC based Cisco VPN client.
Obviously it is not a good idea to use software that is no longer supported, but that aside: what are the known risks with this client app, the hardware backing it, and the tunnel tech itself? I have been looking for CVEs, but haven't found anything 'interesting' yet.
I have recommended that they upgrade to something more modern (and supported), but I would like to have concrete examples of what problems and risks are associated with it, and be able to provide my customers with some real reasons why they should upgrade to use e.g. AnyConnect instead of the old vpn client.