Description
A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Siemens | SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below, SIMATIC S7-400 (incl. F) CPU hardware version 5.0, SIMATIC S7-400H CPU hardware version 4.5 and below | SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below : All versions, SIMATIC S7-400 (incl. F) CPU hardware version 5.0 : All firmware versions < V5.2, SIMATIC S7-400H CPU hardware version 4.5 and below : All versions | — |
Advisories 1
- ICSA-18-137-03 Siemens SIMATIC S7-400 CPU (Update A) CISA ICS & IT advisories · Feb 10, 2020