A vulnerability in SIEMENS SIMATIC S7-300 PN CPUs before V3.X.14 and SIMATIC S7-400 PN CPUs (V6 before V6.0.6, and V7) could allow a remote attacker to cause a Denial of Service condition by sending specially crafted packets to port 80/TCP.
A vulnerability has been identified in SIMATIC S7-300 CPU family, SIMATIC S7-400 V6 and earlier CPU family, SIMATIC S7-400 V7 CPU family. Specially crafted packets sent to port 80/tcp could cause the affected devices to go into defect mode. A cold restart is required to recover the system. This vulnerability affects all SIMATIC S7-300 PN CPUs, and all SIMATIC S7-400 PN V6 and V7 CPUs.