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CVE-2021-33014

28
FAUCET Score

CVE-2021-33014 describes a critical vulnerability affecting KUKA KR C4 control software versions prior to 8.7 and any product running KSS, where hard-coded credentials allow an attacker to gain VxWorks Shell access after login. This vulnerability carries a high CVSS score of 8.8, indicating that it can be exploited remotely with low complexity to achieve high confidentiality, integrity, and availability impacts. While no public exploit intelligence (Metasploit, Nuclei, ExploitDB) or active exploitation (KEV) has been observed, and community discussion remains minimal, the inherent risk from hard-coded credentials warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.7CPE matchmatch criteria
cpe:2.3:o:kuka:kr_c4_firmware:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:kuka:kss:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
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
0.86%
Probability of exploitation in next 30 days
EPSS Percentile
54.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0086 is in the 49th percentile among its peer group of 17,805 CVEs.

Social Chatter

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

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / uscert/ics/advisories/icsa-21-208-01
Third Party AdvisoryUS Government Resource