Is CVE-2021-34561 actively exploited?

No active exploitation of CVE-2021-34561 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-34561 be exploited remotely?

Yes. CVE-2021-34561 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-34561?

CVE-2021-34561 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-34561

CWE-350Published: August 31, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-34561 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.