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Vulnerability record · CVE-2018-4850 · published 16 May 2018

CVE-2018-4850: Siemens simatic s7-400 firmware improper input validation vulnerability

Siemens · Simatic S7 400 Firmware

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.

7.5 CVSS 3.0 High EPSS 2.4% · top 16.5% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/104217 Third Party AdvisoryVDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf Vendor Advisory
https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications Vendor Advisory
http://www.securityfocus.com/bid/104217 Third Party AdvisoryVDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf Vendor Advisory
https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-4850), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.