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CVE-2021-34086

28
FAUCET Score

CVE-2021-34086 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the local web servers of Ultimaker S3, S5, and Ultimaker 3 series 3D printers. The vulnerability arises from a lack of verification for incoming API requests. With a CVSS score of 8.8 (High), this flaw allows an unauthenticated attacker to execute arbitrary actions on the device if a logged-in user is tricked into clicking a malicious link, potentially leading to full compromise of the printer. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.3CPE matchmatch criteria
cpe:2.3:o:ultimaker:ultimaker_s3_firmware:*:*:*:*:*:*:*:*
<= 6.3CPE matchmatch criteria
cpe:2.3:o:ultimaker:ultimaker_s5_firmware:*:*:*:*:*:*:*:*
<= 5.2.16CPE matchmatch criteria
cpe:2.3:o:ultimaker:ultimaker_3_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 43rd percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

kth.diva-portal.org / smash/get/diva2:1623489/FULLTEXT01.pdf
Technical DescriptionThird Party Advisory
ultimaker.com / 3d-printers/ultimaker-3
ProductVendor Advisory
ultimaker.com / 3d-printers/ultimaker-s3
ProductVendor Advisory
ultimaker.com / 3d-printers/ultimaker-s5
ProductVendor Advisory