How severe is CVE-2021-34087?

CVE-2021-34087 has a CVSS 3.x base score of 7.1, rated high 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 low.

Is CVE-2021-34087 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34087?

CVE-2021-34087 primarily affects Ultimaker Ultimaker S3 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-34087?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-34087 published?

CVE-2021-34087 was published on 2022-01-10 and last updated on 2026-06-17.

CVE-2021-34087

CVE-2021-34087 is a high-severity vulnerability in Ultimaker Ultimaker S3 Firmware with a CVSS 3.x base score of 7.1. 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-1021.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 6.8
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1021
Affected product: Ultimaker Ultimaker S3 Firmware
Published: 2022-01-10
Last modified: 2026-06-17

Description

In Ultimaker S3 3D printer, Ultimaker S5 3D printer, Ultimaker 3 3D printer S-line through 6.3 and Ultimaker 3 through 5.2.16, the local webserver can be used for clickjacking. This includes the settings page.

Frequently asked questions

What is CVE-2021-34087?: In Ultimaker S3 3D printer, Ultimaker S5 3D printer, Ultimaker 3 3D printer S-line through 6.3 and Ultimaker 3 through 5.2.16, the local webserver can be used for clickjacking. This includes the settings page.
How severe is CVE-2021-34087?: CVE-2021-34087 has a CVSS 3.x base score of 7.1, rated high 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 low.
Is CVE-2021-34087 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34087?: CVE-2021-34087 primarily affects Ultimaker Ultimaker S3 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-34087?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34087 published?: CVE-2021-34087 was published on 2022-01-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:ultimaker:ultimaker_s3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ultimaker:ultimaker_s5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ultimaker:ultimaker_3_firmware:*:*:*:*:*:*:*:*

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