How severe is CVE-2019-19789?

CVE-2019-19789 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-19789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19789?

CVE-2019-19789 primarily affects Codesys Plcwinnt. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-19789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-19789 published?

CVE-2019-19789 was published on 2019-12-20 and last updated on 2026-06-17.

CVE-2019-19789

CVE-2019-19789 is a medium-severity vulnerability in Codesys Plcwinnt with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Codesys Plcwinnt
Published: 2019-12-20
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2019-19789?: CVE-2019-19789 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-19789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19789?: CVE-2019-19789 primarily affects Codesys Plcwinnt. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-19789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-19789 published?: CVE-2019-19789 was published on 2019-12-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:codesys:plcwinnt:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:runtime_toolkit:*:*:*:*:*:*:x86:*
cpe:2.3:a:codesys:sp_realtime_nt:*:*:*:*:*:*:*:*

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