What’s Vulnerable › Vulnerabilities

CVE-2019-18858

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-20 · updated 2026-06-17
• Weakness: CWE-120

Description

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

Affected products

• CODESYS Control for BeagleBone: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control For Empc-A/Imx6: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control for IOT2000: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control For Linux: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control for PFC100: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control for PFC200: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control For Plcnext: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control for Raspberry Pi: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control Rte: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control Runtime System Toolkit: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Control Win: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Embedded Target Visu Toolkit: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Hmi: before 3.5.15.20 — fixed in 3.5.15.20
• CODESYS Remote Target Visu Toolkit: before 3.5.15.20 — fixed in 3.5.15.20

How to fix

Upgrade to a fixed version: CODESYS Control for BeagleBone 3.5.15.20; CODESYS Control For Empc-A/Imx6 3.5.15.20; CODESYS Control for IOT2000 3.5.15.20; CODESYS Control For Linux 3.5.15.20; CODESYS Control for PFC100 3.5.15.20; CODESYS Control for PFC200 3.5.15.20; CODESYS Control For Plcnext 3.5.15.20; CODESYS Control for Raspberry Pi 3.5.15.20; CODESYS Control Rte 3.5.15.20; CODESYS Control Runtime System Toolkit 3.5.15.20; CODESYS Control Win 3.5.15.20; CODESYS Embedded Target Visu Toolkit 3.5.15.20. Check the vendor advisory for mitigations.

References

• https://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdf
• https://www.tenable.com/security/research/tra-2019-48
• https://customers.codesys.com/fileadmin/data/customers/security/2019/Advisory2019-10_CDS-68341.pdf
• https://www.tenable.com/security/research/tra-2019-48

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