What is CVE-2019-19789?

CVE-2019-19789 is a medium-severity vulnerability in Codesys Plcwinnt, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2019-12-20.

How severe is CVE-2019-19789?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Codesys Plcwinnt

CVE-2019-19789

3S-Smart CODESYS SP Realtime NT before V2.3.7.28, CODESYS Runtime Toolkit 32 bit full before V2.4.7.54, and CODESYS PLCWinNT before V2.4.7.54 allow a NULL pointer dereference.

Published 2019-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.codesys.com (Vendor Advisory)
customers.codesys.com/index.php (Vendor Advisory)

Frequently asked questions

What is CVE-2019-19789?: CVE-2019-19789 is a medium-severity vulnerability in Codesys Plcwinnt, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2019-12-20.
How severe is CVE-2019-19789?: Medium severity. CVSS v3 base score is 6.5 out of 10.