# CVE-2021-34561

## Summary

- **CVE ID:** CVE-2021-34561
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-350
- **Published:** Aug 31, 2021
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- Phoenix Contact — WHA-GW-F2D2-0-AS- Z2-ETH (3.0.8)
- Phoenix Contact — WHA-GW-F2D2-0-AS- Z2-ETH.EIP (3.0.8)

## References

- [CNA](https://cert.vde.com/en-us/advisories/vde-2021-027)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 55.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._