What is CVE-2019-6533?

CVE-2019-6533 is a critical-severity vulnerability in Ics-Cert Pr100088 Modbus Gateway, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2019-02-12.

How severe is CVE-2019-6533?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Ics-Cert Pr100088 Modbus Gateway

CVE-2019-6533

Registers used to store Modbus values can be read and written from the web interface without authentication in the PR100088 Modbus gateway versions prior to Release R02 (or Software Version 1.1.13166).

Vulnerability class: Broken Authentication

Published 2019-02-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.6% 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

Ics-Cert Pr100088 Modbus Gateway — versions All versions prior to Release R02 (or Software Version 1.1.13166)
Kunbus Pr100088 Modbus Gateway
Kunbus Pr100088 Modbus Gateway Firmware

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

ics-cert.us-cert.gov/advisories/ICSA-19-036-05 (US Government Resource, Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2019-6533?: CVE-2019-6533 is a critical-severity vulnerability in Ics-Cert Pr100088 Modbus Gateway, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2019-02-12.
How severe is CVE-2019-6533?: Critical severity. CVSS v3 base score is 9.1 out of 10.