CVE-2011-4879: Siemens SIMATIC HMI Panels

High severity, CVSS 8.5. EPSS: 12.1% chance of exploitation in the next 30 days.

miniweb.exe in the HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime does not properly handle URIs beginning with a 0xfa character, which allows remote attackers to read data from arbitrary memory locations or cause a denial of service (application crash) via a crafted POST request.

Affected products

• Siemens SIMATIC HMI Panels: version comfort_panels only; version mobile_panels only; version mp only; version op only; version tp only
• Siemens Wincc: up to and including v11; version v11 only
• Siemens Wincc Flexible: version 2004 only; version 2005 only; version 2007 only; version 2008 only
• Siemens Wincc Flexible Runtime: any version
• Siemens Wincc Runtime Advanced: version v11 only

Published 2012-02-03. Last modified 2026-06-16.