CVE-2021-34087: Ultimaker 3 Firmware

High severity, CVSS 7.1. EPSS: 0.8% 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 can be used for clickjacking. This includes the settings page.

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.