What is CVE-2019-3953?

CVE-2019-3953 is a critical-severity vulnerability in Advantech Webaccess, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-06-18.

How severe is CVE-2019-3953?

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

Buffer overflow in Advantech Webaccess

CVE-2019-3953

Stack-based buffer overflow in Advantech WebAccess/SCADA 8.4.0 allows a remote, unauthenticated attacker to execute arbitrary code by sending a crafted IOCTL 10012 RPC call.

Vulnerability class: Buffer Overflow

Published 2019-06-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.040 (90.5th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.040 · newest: 0.040 · change: 0.000

Affected products

Advantech Webaccess — versions 8.4.0
Advantech Webaccess/scada — versions 8.4.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.tenable.com/security/research/tra-2019-17 (Not Applicable)
www.tenable.com/security/research/tra-2019-28 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3953?: CVE-2019-3953 is a critical-severity vulnerability in Advantech Webaccess, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2019-06-18.
How severe is CVE-2019-3953?: Critical severity. CVSS v3 base score is 9.8 out of 10.