The Bluetooth SIG announced an Errata to the Bluetooth specification. This Errata concerns a security vulnerability in the specification related to the LE Secure connections feature. Dialog has an updated SDK available including a fix for this errata on the Support Website. Only applications using the LE Secure Connections feature have to consider upgrading to the latest SDK.
The Bluetooth SIG communication can be found at the following link: https://www.bluetooth.com/news/unknown/2018/07/bluetooth-sig-security-update
The following table shows which Dialog Bluetooth ICs support LE Secure Connections: