CVE-2011-4509: Siemens SIMATIC HMI Panels

High severity, CVSS 10.0. EPSS: 2% chance of exploitation in the next 30 days.

The HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008; WinCC V11 (aka TIA portal); the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime has an improperly selected default password for the administrator account, which makes it easier for remote attackers to obtain access via a brute-force approach involving many HTTP requests.

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: 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.