Memory leak in Siemens Automation License Manager (ALM) 4.x and 5.x before 5.2 allows remote attackers to cause a denial of service (memory consumption) via crafted packets.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-4616
http://www.us-cert.gov/control_systems/pdf/ICSA-12-349-01.pdf