CVE-2023-49621: Siemens SIMATIC Cn 4100 Firmware

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC CN 4100 (All versions < V2.7). The "intermediate installation" system state of the affected application uses default credential with admin privileges. An attacker could use the credentials to gain complete control of the affected device.

Affected products

• Siemens SIMATIC Cn 4100 Firmware: before 2.7 (fixed in 2.7)

Published 2024-01-09. Last modified 2026-06-17.