What is CVE-2019-6521?

CVE-2019-6521 is a high-severity vulnerability in Advantech Webaccess\/scada, classified under Improper Authentication. CVSS score: 8.6/10. Published 2019-02-05.

How severe is CVE-2019-6521?

High severity. CVSS v3 base score is 8.6 out of 10.

Auth bypass in Advantech Webaccess\/scada

CVE-2019-6521

WebAccess/SCADA, Version 8.3. Specially crafted requests could allow a possible authentication bypass that could allow an attacker to obtain and manipulate sensitive information.

Vulnerability class: Broken Authentication

Published 2019-02-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.019 (79.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Advantech Webaccess\/scada — versions 8.3

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

ics-cert.us-cert.gov/advisories/ICSA-19-024-01 (US Government Resource, Third Party Advisory)
www.securityfocus.com/bid/106722 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2019-6521?: CVE-2019-6521 is a high-severity vulnerability in Advantech Webaccess\/scada, classified under Improper Authentication. CVSS score: 8.6/10. Published 2019-02-05.
How severe is CVE-2019-6521?: High severity. CVSS v3 base score is 8.6 out of 10.