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Fencer Intel
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 5y ago modified 4mo 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 59%
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.

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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 59% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.