What is CVE-2019-6550?

CVE-2019-6550 is a critical-severity vulnerability in Advantech Webaccess, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2019-04-05.

How severe is CVE-2019-6550?

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

Buffer overflow in Advantech Webaccess

CVE-2019-6550

Advantech WebAccess/SCADA, Versions 8.3.5 and prior. Multiple stack-based buffer overflow vulnerabilities, caused by a lack of proper validation of the length of user-supplied data, may allow remote code execution.

Vulnerability class: Buffer Overflow

Published 2019-04-05 · 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: 0.061 (93.4th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.061 · newest: 0.061 · change: 0.000

Affected products

Advantech Webaccess
Advantech Webaccess/scada — versions Versions 8.3.5 and prior.

Weakness classification (CWE)

References

ics-cert.us-cert.gov/advisories/ICSA-19-092-01 (US Government Resource, Third Party Advisory)
www.zerodayinitiative.com/advisories/ZDI-19-585/ (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2019-6550?: CVE-2019-6550 is a critical-severity vulnerability in Advantech Webaccess, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2019-04-05.
How severe is CVE-2019-6550?: Critical severity. CVSS v3 base score is 9.8 out of 10.