What’s Vulnerable › Vulnerabilities

CVE-2018-5440

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-02-15 · updated 2026-06-17
• Weakness: CWE-121

Description

A Stack-based Buffer Overflow issue was discovered in 3S-Smart CODESYS Web Server. Specifically: all Microsoft Windows (also WinCE) based CODESYS web servers running stand-alone Version 2.3, or as part of the CODESYS runtime system running prior to Version V1.1.9.19. A crafted request may cause a buffer overflow and could therefore execute arbitrary code on the web server or lead to a denial-of-service condition due to a crash in the web server.

Affected products

• 3S-Software Codesys Runtime System: before 1.1.9.19 — fixed in 1.1.9.19
• 3S-Software Codesys Web Server: 2.3

How to fix

Upgrade to a fixed version: 3S-Software Codesys Runtime System 1.1.9.19. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/102909
• https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02
• http://www.securityfocus.com/bid/102909
• https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02

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