CVE-2011-3321: Siemens SIMATIC Wincc Flexible Runtime

High severity, CVSS 9.3. EPSS: 7.1% chance of exploitation in the next 30 days.

Heap-based buffer overflow in the Siemens WinCC Runtime Advanced Loader, as used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC (TIA Portal) Runtime Advanced, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted packet to TCP port 2308.

Affected products

• Siemens SIMATIC Wincc Flexible Runtime: any version
• Siemens SIMATIC Wincc Runtime: affected versions not specified

Published 2011-09-16. Last modified 2026-06-16.