What is CVE-2021-40872?

CVE-2021-40872 is a high-severity vulnerability in Softing Smartlink Hw-Dp, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.5/10. Published 2021-11-10.

How severe is CVE-2021-40872?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Softing Smartlink Hw-Dp

CVE-2021-40872

An issue was discovered in Softing Industrial Automation uaToolkit Embedded before 1.40. Remote attackers to cause a denial of service (DoS) or login as an anonymous user (bypassing security checks) by sending crafted messages to a OPC/UA server. The server process may crash unexpectedly because of an invalid type cast, and must be restarted.

Published 2021-11-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.015 (74.4th percentile), scored 2026-10-31.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

industrial.softing.com/ (Vendor Advisory)
industrial.softing.com/fileadmin/sof-files/pdf/ia/support/Security_Bulletin_CVE… (Vendor Advisory)

Frequently asked questions

What is CVE-2021-40872?: CVE-2021-40872 is a high-severity vulnerability in Softing Smartlink Hw-Dp, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 7.5/10. Published 2021-11-10.
How severe is CVE-2021-40872?: High severity. CVSS v3 base score is 7.5 out of 10.