CVE-2021-34086: Ultimaker 3 Firmware

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Ultimaker Ultimaker 3 Firmware: up to and including 5.2.16
• Ultimaker Ultimaker s3 Firmware: up to and including 6.3
• Ultimaker Ultimaker s5 Firmware: up to and including 6.3

Published 2022-01-10. Last modified 2026-06-17.