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.
https://us-cert.cisa.gov/ics/advisories/icsa-21-068-02
https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf