What is CVE-2021-42577?

CVE-2021-42577 is a high-severity vulnerability in Softing Datafeed Opc Suite, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2022-03-11.

How severe is CVE-2021-42577?

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

NULL pointer dereference in Softing Datafeed Opc Suite

CVE-2021-42577

An issue was discovered in Softing OPC UA C++ SDK before 5.70. A malformed OPC/UA message abort packet makes the client crash with a NULL pointer dereference.

Published 2022-03-11 · 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: 0.010 (61.5th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

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

Frequently asked questions

What is CVE-2021-42577?: CVE-2021-42577 is a high-severity vulnerability in Softing Datafeed Opc Suite, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2022-03-11.
How severe is CVE-2021-42577?: High severity. CVSS v3 base score is 7.5 out of 10.