On BIG-IP APM 11.6.0-11.6.3, an insecure AES ECB mode is used for orig_uri parameter in an undisclosed /vdesk link of APM virtual server configured with an access profile, allowing a malicious user to build a redirect URI value using different blocks of cipher texts.
https://support.f5.com/csp/article/K66171422
http://www.securityfocus.com/bid/105353
http://sbudella.altervista.org/blog/20180911-cve-2018-5548.html