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TI-2021-12621 Aliases CVE-2021-33014GHSA-jx6w-5q44-8g67

KUKA KR C4 - Use of Hard-Coded Credentials

Priority MEDIUM 42CWE-798Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-798.

Summary

An attacker can gain VxWorks Shell after login due to hard-coded credentials on a KUKA KR C4 control software for versions prior to 8.7 or any product running KSS.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00917 60th percentileScored 2026-11-07
Fix Fixed KR C4 (KUKA): v8.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KUKAKR C4All to before v8.7v8.7Patch availableCNA
KUKAKSS (KUKA.SystemSoftware)All—No fix listedCNA
  • KR C4 VendorKUKA Affected All to before v8.7 Fixed in v8.7 Patch available CNA
  • KSS (KUKA.SystemSoftware) VendorKUKA Affected All Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:kuka:kr_c4_firmware:*:*:*:*:*:*:*:*before 8.7VulnerableKUKA
cpe:2.3:h:kuka:kr_c4:-:*:*:*:*:*:*:*not specified by NVDRunning onKUKA
cpe:2.3:o:kuka:kss:*:*:*:*:*:*:*:*all versionsVulnerableKUKA
  • cpe:2.3:o:kuka:kr_c4_firmware:*:*:*:*:*:*:*:* Versions before 8.7 Vulnerable ·KUKA
  • cpe:2.3:h:kuka:kr_c4:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·KUKA
  • cpe:2.3:o:kuka:kss:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·KUKA

Remediation

  • Fix · CNA KR C4 (KUKA) Fixed in v8.7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    KUKA KR C4 v8.7

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2021-12623 KUKA KR C4 - Use of Hard-Coded CredentialsPriority MEDIUM 51
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-33014
  2. 2026-10-03 Alias added: GHSA-jx6w-5q44-8g67

References

Advisory 1

  • TI-2021-12623 KUKA KR C4 - Use of Hard-Coded Credentials CVSS 3.1CRITICAL 9.8
  • TI-2020-08275 RVD#2550: Terminate Critical Services in KUKA controller KR C4 CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences