What is CVE-2021-34087?

CVE-2021-34087 is a high-severity vulnerability in Ultimaker 3, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 7.1/10. Published 2022-01-10.

How severe is CVE-2021-34087?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Ultimaker 3

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.

Published 2022-01-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (55.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-1021 — Improper Restriction of Rendered UI Layers or Frames (Clickjacking)

References

ultimaker.com/3d-printers/ultimaker-s3 (Product, Vendor Advisory)
ultimaker.com/3d-printers/ultimaker-s5 (Product, Vendor Advisory)
kth.diva-portal.org/smash/get/diva2:1623489/FULLTEXT01.pdf (Technical Description, Third Party Advisory)

Frequently asked questions

What is CVE-2021-34087?: CVE-2021-34087 is a high-severity vulnerability in Ultimaker 3, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 7.1/10. Published 2022-01-10.
How severe is CVE-2021-34087?: High severity. CVSS v3 base score is 7.1 out of 10.