Cisco ONS 15310-CL, 15310-MA, 15327, 15454, 15454 SDH, and 15600 with software 7.0.2 through 7.0.6, 7.2.2, 8.0.x, 8.5.1, and 8.5.2 allows remote attackers to cause a denial of service (control-card reset) via a crafted TCP session.