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Vulnerability record · CVE-2016-9158 · published 17 December 2016

CVE-2016-9158: Siemens simatic s7-300 cpu firmware improper input validation vulnerability

Siemens · Simatic S7 300 Cpu Firmware

A vulnerability has been identified in SIMATIC S7-300 CPU family (All versions), SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 V6 and earlier CPU family (All versions), SIMATIC S7-400 V7 CPU family (All versions). Specially crafted packets sent to port 80/tcp could cause the affected devices to go into defect mode. A cold restart is required to recover the system.

7.5 CVSS 3.1 High EPSS 3.0% · top 13.0% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 7.8
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

A vulnerability has been identified in SIMATIC S7-300 CPU family (All versions), SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 V6 and earlier CPU family (All versions), SIMATIC S7-400 V7 CPU family (All versions). Specially crafted packets sent to port 80/tcp could cause the affected devices to go into defect mode. A cold restart is required to recover the system.

CVSS:3.1/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/94820
http://www.securitytracker.com/id/1037434
https://cert-portal.siemens.com/productcert/pdf/ssa-731239.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-348-05
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-731239.pdf
http://www.securityfocus.com/bid/94820
http://www.securitytracker.com/id/1037434
https://cert-portal.siemens.com/productcert/pdf/ssa-731239.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-348-05
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-731239.pdf

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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-2016-9158), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.