Stack-based buffer overflow in the CmpWebServer component in 3S CoDeSys 3.4 SP4 Patch 2 and earlier, as used on the ABB AC500 PLC and possibly other products, allows remote attackers to execute arbitrary code via a long URI to TCP port 8080.
http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-336-01A.pdf
http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-336-01.pdf
http://secunia.com/advisories/47018
http://seclists.org/bugtraq/2011/Nov/178