A vulnerability has been identified in All other SIPROTEC 5 device types with CPU variants CP300 and CP100 and the respective Ethernet communication modules (All versions ) DIGSI 5 engineering software (All versions < V7.90) SIPROTEC 5 device types 6MD85 6MD86 6MD89 7UM85 7SA87 7SD87 7SL87 7VK87 7SA82 7SA86 7SD82 7SD86 7SL82 7SL86 7SJ86 7SK82 7SK85 7SJ82 7SJ85 7UT82 7UT85 7UT86 7UT87 and 7VE85 with CPU variants CP300 and CP100 and the respective Ethernet communication modules (All versions < V7.90) SIPROTEC 5 device types 7SS85 and 7KE85 (All versions < V8.01) SIPROTEC 5 device types with CPU variants CP200 and the respective Ethernet communication modules (All versions < V7.59) SIPROTEC 5 relays with CPU variants CP200 and the respective Ethernet communication modules (All versions < V7.59). Specially crafted packets sent to port 443/TCP could cause a Denial of Service condition.