CVE-2021-34086

Name: CVE-2021-34086
Creator: NVD / NIST
Published: 2022-01-10T14:10:17.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.53%

Last modified Jun 17, 2026

CVE-2021-34086 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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 hosts APIs vulnerable to CSRF. They do not verify incoming requests.. EPSS estimates a 0.53% chance of exploitation in the next 30 days.

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 hosts APIs vulnerable to CSRF. They do not verify incoming requests.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.53%

40.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Ultimaker	Ultimaker S3 Firmware	<= 6.3
Ultimaker	Ultimaker S5 Firmware	<= 6.3
Ultimaker	Ultimaker 3 Firmware	<= 5.2.16

References

https://kth.diva-portal.org/smash/get/diva2:1623489/FULLTEXT01.pdfTechnical Description, Third Party Advisory
https://ultimaker.com/3d-printers/ultimaker-3Product, Vendor Advisory
https://ultimaker.com/3d-printers/ultimaker-s3Product, Vendor Advisory
https://ultimaker.com/3d-printers/ultimaker-s5Product, Vendor Advisory
https://kth.diva-portal.org/smash/get/diva2:1623489/FULLTEXT01.pdfTechnical Description, Third Party Advisory
https://ultimaker.com/3d-printers/ultimaker-3Product, Vendor Advisory
https://ultimaker.com/3d-printers/ultimaker-s3Product, Vendor Advisory
https://ultimaker.com/3d-printers/ultimaker-s5Product, Vendor Advisory

Timeline

Published: Jan 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34086?

How severe is CVE-2021-34086?

CVE-2021-34086 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34086?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34086?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST