How severe is CVE-2021-34559?

CVE-2021-34559 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-34559 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34559?

CVE-2021-34559 primarily affects Pepperl-fuchs Wha-gw-f2d2-0-as-z2-eth Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-34559?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34559 published?

CVE-2021-34559 was published on 2021-08-31 and last updated on 2026-06-17.

CVE-2021-34559

CVE-2021-34559 is a medium-severity vulnerability in Pepperl-fuchs Wha-gw-f2d2-0-as-z2-eth Firmware with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-444.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 5.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-444
Affected product: Pepperl-fuchs Wha-gw-f2d2-0-as-z2-eth Firmware
Published: 2021-08-31
Last modified: 2026-06-17

Description

In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 a vulnerability may allow remote attackers to rewrite links and URLs in cached pages to arbitrary strings.

Frequently asked questions

What is CVE-2021-34559?: In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 a vulnerability may allow remote attackers to rewrite links and URLs in cached pages to arbitrary strings.
How severe is CVE-2021-34559?: CVE-2021-34559 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-34559 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34559?: CVE-2021-34559 primarily affects Pepperl-fuchs Wha-gw-f2d2-0-as-z2-eth Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-34559?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34559 published?: CVE-2021-34559 was published on 2021-08-31 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:o:pepperl-fuchs:wha-gw-f2d2-0-as-z2-eth_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:pepperl-fuchs:wha-gw-f2d2-0-as-z2-eth.eip_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Pepperl-fuchs Wha-gw-f2d2-0-as-z2-eth Firmware

CVE-2021-34565 — Critical (CVSS 9.8): In PEPPERL+FUCHS WirelessHART-Gateway 3.0.7 to 3.0.9 the SSH and telnet services are active with hard-coded credentials.
CVE-2021-34561 — High (CVSS 7.5): In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 serious issue exists, if the application is not externally accessible or…
CVE-2021-33555 — High (CVSS 7.5): In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.7 the filename parameter is vulnerable to unauthenticated path traversal…
CVE-2021-34564 — Medium (CVSS 5.5): Any cookie-stealing vulnerabilities within the application or browser would enable an attacker to steal the user's…
CVE-2021-34560 — Medium (CVSS 5.5): In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.9 a form contains a password field with autocomplete enabled. The stored…
CVE-2021-34562 — Medium (CVSS 5.4): In PEPPERL+FUCHS WirelessHART-Gateway 3.0.8 it is possible to inject arbitrary JavaScript into the application's…

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