Cloud access security brokers (CASB) insert security between enterprises and their cloud services by providing visibility and access control, but IPv6 could be causing a dangerous blind spot.
That’s because CASBs might not support IPv6, which could be in wide corporate use even in enterprises that choose IPv4 as their preferred protocol.
For example, end users working remotely have a far greater chance of connecting via IPv6 than when they are in the office. Mobile providers collectively have a high percentage of IPv6-connected subscribers and broadband residential Internet customers often have IPv6 connectivity without realizing it. Internet service providers and software-as-a-service (SaaS) vendors both widely support IPv6, so a mobile worker accessing, say, DropBox over a Verizon 4G wireless service might very well connect via IPv6.