What is CVE-2021-42706?

CVE-2021-42706 is a high-severity vulnerability in Advantech Hmi Designer, classified under Use After Free. CVSS score: 7.8/10. Published 2021-11-15.

How severe is CVE-2021-42706?

High severity. CVSS v3 base score is 7.8 out of 10.

Use After Free in Advantech Hmi Designer

CVE-2021-42706

This vulnerability could allow an attacker to disclose information and execute arbitrary code on affected installations of WebAccess/MHI Designer

Vulnerability class: Use-After-Free

Published 2021-11-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (19.4th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Advantech Hmi Designer — versions All versions
Advantech Webaccess Hmi Designer

Weakness classification (CWE)

CWE-416 — Use After Free

References

us-cert.cisa.gov/ics/advisories/icsa-21-173-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-42706?: CVE-2021-42706 is a high-severity vulnerability in Advantech Hmi Designer, classified under Use After Free. CVSS score: 7.8/10. Published 2021-11-15.
How severe is CVE-2021-42706?: High severity. CVSS v3 base score is 7.8 out of 10.