High severity7.5NVD Advisory· Published May 16, 2018· Updated Jun 17, 2026
CVE-2018-4850
CVE-2018-4850
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: <= hardware v4.0 all firmware / hardware v5.0 firmware <V5.2
- Siemens AG/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 belowv5Range: SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below : All versions
Patches
Vulnerability mechanics
References
3- www.securityfocus.com/bid/104217nvdThird Party AdvisoryVDB Entry
- cert-portal.siemens.com/productcert/pdf/ssa-914382.pdfnvdVendor Advisory
- www.siemens.com/global/en/home/products/services/cert.htmlnvdVendor Advisory
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