What is CVE-2021-40388?

CVE-2021-40388 is a high-severity vulnerability in Advantech Sq Manager, classified under Incorrect Default Permissions. CVSS score: 8.8/10. Published 2022-01-28.

How severe is CVE-2021-40388?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Advantech Sq Manager

CVE-2021-40388

A privilege escalation vulnerability exists in Advantech SQ Manager Server 1.0.6. A specially-crafted file can be replaced in the system to escalate privileges to NT SYSTEM authority. An attacker can provide a malicious file to trigger this vulnerability.

Published 2022-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Advantech Sq Manager — versions 1.0.6

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1399 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40388?: CVE-2021-40388 is a high-severity vulnerability in Advantech Sq Manager, classified under Incorrect Default Permissions. CVSS score: 8.8/10. Published 2022-01-28.
How severe is CVE-2021-40388?: High severity. CVSS v3 base score is 8.8 out of 10.