CVE-2011-4534
ZenSysSrv.exe in Ing. Punzenberger COPA-DATA zenon 6.51 SP0 allows remote attackers to cause a denial of service (service crash) or possibly execute arbitrary code via a series of connections and disconnections on TCP port 1101, aka Reference Number 25212.
Date published : 2012-02-10
http://www.us-cert.gov/control_systems/pdf/ICSA-12-013-01.pdf