SSA-557541 V1.2 (Last Update: 2023-04-11): Denial-of-Service Vulnerability in SIMATIC S7-400 CPUs

SIMATIC S7-400 CPU devices contain an input validation vulnerability that could allow an attacker to create a Denial-of-Service condition. A restart is needed to restore normal operations.

Siemens has released an update for SIMATIC S7-410 V10 CPU family and SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants for both) and recommends to update to the latest version. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not yet available.

countermeasures cpu cpus devices family input input validation latest operations products restore service siemens simatic ssa update updates validation version vulnerability