Heap-based buffer overflow in Automated Solutions Modbus/TCP Master OPC Server before 3.0.2 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a MODBUS response packet with a crafted length field.
https://exchange.xforce.ibmcloud.com/vulnerabilities/64944
http://www.vupen.com/english/advisories/2011/0209
http://www.us-cert.gov/control_systems/pdf/ICSA-10-322-02A.pdf
http://www.kb.cert.org/vuls/id/768840