CVE-2021-25676: Siemens Ruggedcom RM1224 Firmware

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A vulnerability has been identified in RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3). Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically.

Affected products

• Siemens Ruggedcom RM1224 Firmware: version 6.3 only
• Siemens Scalance M-800 Firmware: version 6.3 only
• Siemens Scalance s615 Firmware: version 6.3 only
• Siemens Scalance Sc-600 Firmware: from 2.1, before 2.1.3 (fixed in 2.1.3)

Published 2021-03-15. Last modified 2026-06-17.