What is CVE-2021-30192?

CVE-2021-30192 is a critical-severity vulnerability in Codesys V2 Web Server. CVSS score: 9.8/10. Published 2021-05-25.

How severe is CVE-2021-30192?

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

Vulnerability in Codesys V2 Web Server

CVE-2021-30192

CODESYS V2 Web-Server before 1.1.9.20 has an Improperly Implemented Security Check.

Published 2021-05-25 · 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: 0.012 (65.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

References

customers.codesys.com/index.php (Permissions Required, Vendor Advisory)
customers.codesys.com/index.php (Vendor Advisory)

Frequently asked questions

What is CVE-2021-30192?: CVE-2021-30192 is a critical-severity vulnerability in Codesys V2 Web Server. CVSS score: 9.8/10. Published 2021-05-25.
How severe is CVE-2021-30192?: Critical severity. CVSS v3 base score is 9.8 out of 10.