F5 BIG-IP APM 11.4.1 before 11.4.1 HF9, 11.5.x before 11.5.3, and 11.6.0 before 11.6.0 HF4 allow remote attackers to cause a denial of service or execute arbitrary code via unspecified vectors related to processing a Citrix Remote Desktop connection through a virtual server configured with a remote desktop profile, aka an "Out-of-bounds memory vulnerability."