The June 12, 2019, out-of-band security update addressed a critical issue where a customer's agent information could potentially be obtained by a third party who had access to both the customer's server IP address and unique service URL, allowing such third party to potentially perform other unauthorized actions (e.g. agent uninstall) via an API call.
The out-of-band update was completed as of 21:00 (UTC +8) on June 12, 2019.
There is no evidence that the issue was exploited by any malicious outside entities and was promptly addressed after a responsible disclosure.