CVE-2021-40396

Name: CVE-2021-40396
Creator: NVD / NIST
Published: 2022-01-28T20:15:11.44+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-40396 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A privilege escalation vulnerability exists in the installation of Advantech DeviceOn/iService 1.1.7. A specially-crafted file can be replaced in the system to escalate privileges to NT SYSTEM authority. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

A privilege escalation vulnerability exists in the installation of Advantech DeviceOn/iService 1.1.7. 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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

0.36%

28.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Advantech	Deviceon\/Iservice	1.1.7

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1408Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1408Exploit, Third Party Advisory

Timeline

Published: Jan 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40396?

How severe is CVE-2021-40396?

CVE-2021-40396 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40396?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40396?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST