CVE-2011-4508: Siemens SIMATIC HMI Panels

High severity, CVSS 9.3. EPSS: 3% chance of exploitation in the next 30 days.

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 generates predictable authentication tokens for cookies, which makes it easier for remote attackers to bypass authentication via a crafted cookie.

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.