CVE-2011-4879: miniweb.exe in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V1...

Security readout for executives and security teams

This Siemens HMI web server flaw can let a remote attacker crash the HMI web application or read data from process memory. In an industrial setting, that can disrupt operator visibility or expose sensitive runtime information. The source bundle does not show confirmed active exploitation. Exposure is most likely where affected Siemens HMI web server components are enabled and reachable on control, engineering, remote access, or flat enterprise networks. Internet exposure would raise urgency substantially, but the bundle does not provide exposure telemetry. Treat this as a high-priority industrial control exposure when affected HMIs are reachable. Prioritize plants with remote access, shared enterprise connectivity, or operational reliance on HMI web services. No confirmed active exploitation is cited, but public exploit references increase risk. Mitigation focus: Upgrade WinCC flexible 2004-2008 to SP3 or later where applicable.; Upgrade WinCC V11/TIA Portal to SP2 Update 1 or later where applicable.; Check Siemens SSA-345442 for product-specific replacement or update guidance..

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.