CVE-2019-18858

CRITICALNVD 9.89.8—

9.8

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 61.4%
KEV: Not listed

Published

November 20, 2019

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdf
cve@mitrehttps://www.tenable.com/security/research/tra-2019-48
af854a3a-2127-422b-91ae-364da2661108https://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdf
af854a3a-2127-422b-91ae-364da2661108https://www.tenable.com/security/research/tra-2019-48

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 11:27 UTCEG score recompute
2026-05-27 11:27 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2019-18858?

CVE-2019-18858 is a critical vulnerability published on November 20, 2019. CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

When was CVE-2019-18858 disclosed?

CVE-2019-18858 was first published in the National Vulnerability Database on November 20, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-18858 actively exploited?

CVE-2019-18858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-18858?

CVE-2019-18858 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2019-18858?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18858, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-18858

Explore →

Is Your Infrastructure Affected by CVE-2019-18858?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2019-18858

📅 Published

🔄 Last Modified

🔗 References (4)