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CVE-2021-34087

23
FAUCET Score

CVE-2021-34087 describes a clickjacking vulnerability in the local webserver of Ultimaker S3, S5, and Ultimaker 3 series 3D printers, affecting firmware versions through 6.3 and 5.2.16 respectively. This vulnerability, rated 7.1 HIGH, allows an unauthenticated attacker to trick a user into performing unintended actions on the settings page through a crafted webpage, leading to low impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion 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

7.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.81%
Probability of exploitation in next 30 days
EPSS Percentile
53.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0081 is in the 55th percentile among its peer group of 14,848 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-s3
ProductVendor Advisory
ultimaker.com / 3d-printers/ultimaker-s5
ProductVendor Advisory