What is CVE-2023-2866?

CVE-2023-2866 is a high-severity vulnerability in Advantech Webaccess, classified under CWE-351. CVSS score: 7.3/10. Published 2023-06-07.

How severe is CVE-2023-2866?

High severity. CVSS v3 base score is 7.3 out of 10.

Vulnerability in Advantech Webaccess

CVE-2023-2866

If an attacker can trick an authenticated user into loading a maliciously crafted .zip file onto Advantech WebAccess version 8.4.5, a web shell could be used to give the attacker full control of the SCADA server.

Published 2023-06-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.3th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Advantech Webaccess — versions 8.4.5
Advantech Webaccess/scada — versions 8.4.5

Weakness classification (CWE)

References

www.cisa.gov/news-events/ics-advisories/icsa-23-150-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2023-2866?: CVE-2023-2866 is a high-severity vulnerability in Advantech Webaccess, classified under CWE-351. CVSS score: 7.3/10. Published 2023-06-07.
How severe is CVE-2023-2866?: High severity. CVSS v3 base score is 7.3 out of 10.