A vulnerability has been identified in CP1604 (All versions < V2.8), CP1616 (All versions < V2.8), Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller (All versions < V4.1.1 Patch 05), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200 (All versions < V4.5.0 Patch 01), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200P (All versions < V4.5.0), SCALANCE X-200IRT (All versions < V5.2.1), SIMATIC ET 200M (All versions), SIMATIC ET 200S (All versions), SIMATIC ET 200ecoPN (except 6ES7148-6JD00-0AB0 and 6ES7146-6FF00-0AB0) (All versions), SIMATIC ET 200pro (All versions), SIMATIC PN/PN Coupler 6ES7158-3AD01-0XA0 (All versions), SIMATIC S7-300 CPU family (incl. F) (All versions), SIMATIC S7-400 (incl. F) V6 and below (All versions), SIMATIC S7-400 PN/DP V7 (incl. F) (All versions), SIMATIC WinAC RTX (F) 2010 (All versions < SIMATIC WinAC RTX 2010 SP3), SIMOTION (All versions), SINAMICS DCM (All versions < V1.5 HF1), SINAMICS DCP (All versions), SINAMICS G110M V4.7 (Control Unit) (All versions < V4.7 SP10 HF5), SINAMICS G120 V4.7 (Control Unit) (All versions < V4.7 SP10 HF5), SINAMICS G130 V4.7 (Control Unit) (All versions < V4.7 HF29), SINAMICS G150 (Control Unit) (All versions < V4.8), SINAMICS GH150 V4.7 (Control Unit) (All versions), SINAMICS GL150 V4.7 (Control Unit) (All versions), SINAMICS GM150 V4.7 (Control Unit) (All versions), SINAMICS S110 (Control Unit) (All versions), SINAMICS S120 V4.7 (Control Unit and CBE20) (All versions < V4.7 HF34), SINAMICS S150 (Control Unit) (All versions < V4.8), SINAMICS SL150 V4.7 (Control Unit) (All versions), SINAMICS SM120 V4.7 (Control Unit) (All versions), SINUMERIK 828D (All versions < V4.8 SP5), SINUMERIK 840D sl (All versions). An attacker with network access to an affected product may cause a Denial-of-Service condition by breaking the real-time synchronization (IRT) of the affected installation. The security vulnerability could be exploited by an unauthenticated attacker with network access to the affected installation. No user interaction is required to exploit this security vulnerability. The vulnerability impacts the availability of the affected installations.