CVE-2011-4875: Stack-based buffer overflow in HmiLoad in the runtime loader in Siemens WinCC flexible 2004, 2005, 2007, an...

Security readout for executives and security teams

This is an old Siemens industrial HMI vulnerability that can let a remote attacker run code on affected WinCC and SIMATIC HMI systems when Transfer Mode is enabled. It matters most where engineering or runtime systems are reachable from untrusted networks or poorly segmented plant networks. Exposure is likely limited to Siemens HMI engineering/runtime environments and panels with Transfer Mode enabled. Risk rises sharply if those systems are reachable from corporate, remote access, or vendor networks rather than isolated maintenance networks. Prioritize review in OT environments where Siemens HMIs support production operations. This is not shown as actively exploited in the bundle, but remote code execution against control-system interfaces can create operational disruption risk. Mitigation focus: Review Siemens SSA-345442 and ICS-CERT guidance for supported fixes or compensating controls.; Disable Transfer Mode when not actively needed for authorized maintenance.; Restrict HMI loader access to trusted engineering workstations and maintenance networks..

Prepared

Jun 27, 2026, 17:28 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.