A vulnerability has been identified in Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller (All versions), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200 (All Versions < V4.5), Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200P (All Versions < V4.6), PROFINET Driver for Controller (All Versions < V2.1), RUGGEDCOM RM1224 (All versions < V4.3), SCALANCE M-800 / S615 (All versions < V4.3), SCALANCE W700 IEEE 802.11n (All versions <= V6.0.1), SCALANCE X-200 switch family (incl. SIPLUS NET variants) (All versions), SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) (All Versions < V5.3), SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) (All versions), SCALANCE XB-200, XC-200, XP-200, XF-200BA and XR-300WG (All Versions < V3.0), SCALANCE XM-400 switch family (All Versions < V6.0), SCALANCE XR-500 switch family (All Versions < V6.0), SIMATIC CP 1616 and CP 1604 (All Versions < V2.8), SIMATIC CP 343-1 (incl. SIPLUS NET variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS NET variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 LEAN (incl. SIPLUS NET variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS NET variants) (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS NET variants) (All versions), SIMATIC CP 443-1 OPC UA (All versions), SIMATIC ET200AL IM 157-1 PN (All versions), SIMATIC ET200M IM153-4 PN IO HF (incl. SIPLUS variants) (All versions), SIMATIC ET200M IM153-4 PN IO ST (incl. SIPLUS variants) (All versions), SIMATIC ET200MP IM155-5 PN HF (incl. SIPLUS variants) (All Versions < V4.2.0), SIMATIC ET200MP IM155-5 PN ST (incl. SIPLUS variants) (All Versions < V4.1.0), SIMATIC ET200S (incl. SIPLUS variants) (All versions), SIMATIC ET200SP IM155-6 PN Basic (incl. SIPLUS variants) (All versions), SIMATIC ET200SP IM155-6 PN HF (incl. SIPLUS variants) (All Versions < V3.3.1), SIMATIC ET200SP IM155-6 PN ST (incl. SIPLUS variants) (All Versions < V4.1.0), SIMATIC ET200ecoPN (except 6ES7148-6JD00-0AB0 and 6ES7146-6FF00-0AB0) (All versions), SIMATIC ET200pro, IM 154-3 PN HF (All versions), SIMATIC ET200pro, IM 154-4 PN HF (All versions), SIMATIC IPC Support, Package for VxWorks (All versions), SIMATIC MV400 family (All versions), SIMATIC PN/PN Coupler 6ES7158-3AD01-0XA0 (incl. SIPLUS NET variant) (All Versions), SIMATIC RF180C (All versions), SIMATIC RF182C (All versions), SIMATIC RF600 family (All versions < V3), SINAMICS DCP (All Versions < V1.3). Profinet-IO (PNIO) stack versions prior V06.00 do not properly limit internal resource allocation when multiple legitimate diagnostic package requests are sent to the DCE-RPC interface. This could lead to a denial of service condition due to lack of memory for devices that include a vulnerable version of the stack. The security vulnerability could be exploited by an attacker with network access to an affected device. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise the availability of the device.