The lmadmin component in Flexera FlexNet Publisher (aka Flex License Manager) before 2015 SP5 and 2016 before R1 SP1, as used by Citrix License Server for Windows before 11.14.0.1 and Citrix License Server VPX before 11.14.0.1, allows remote attackers to cause a denial of service (crash) via a type 2F packet with a '01 19' opcode.