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Fencer Vulns
high 7.5

CVE-2021-34561 json

A vulnerability in WirelessHART-Gateway <= 3.0.8 allows to bypass any IP or firewall based access restrictions through DNS rebinding

published 2021-08-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21211

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-097-01 updated cvss 7.5

Pepperl+Fuchs WirelessHART-Gateway

  • Pepperl+Fuchs WHA-GW-F2D2-0-AS- Z2-ETH 3.0.7, 3.0.8, 3.0.9 Pepperl+Fuchs WHA-GW-F2D2-0-AS- Z2-ETH.EIP 3.0.7, 3.0.8, 3.0.9
    affected: mitigation “Minimize network exposure for affected products and ensure they are not accessible via the Internet.” cert.vde.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH
  • Phoenix Contact WHA-GW-F2D2-0-AS- Z2-ETH.EIP

Classification

Weakness
  • CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.