What is CVE-2021-33016?

CVE-2021-33016 is a critical-severity vulnerability in Kuka Kr C4, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2022-05-26.

How severe is CVE-2021-33016?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Kuka Kr C4

CVE-2021-33016

An attacker can gain full access (read/write/delete) to sensitive folders due to hard-coded credentials on KUKA KR C4 control software for versions prior to 8.7 or any product running KSS.

Published 2022-05-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Kuka Kr C4 — versions All
Kuka Kr C4
Kuka Kr C4 Firmware
Kuka Kss
Kuka Kss (Kuka.systemsoftware) — versions All

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

www.cisa.gov/uscert/ics/advisories/icsa-21-208-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-33016?: CVE-2021-33016 is a critical-severity vulnerability in Kuka Kr C4, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2022-05-26.
How severe is CVE-2021-33016?: Critical severity. CVSS v3 base score is 9.8 out of 10.