CVE-2018-5440

9.8 criticalEPSS 3.1%

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 3.1% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWEs: CWE-787, CWE-121
Published: 2018-02-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

3s-software:codesys_runtime_system
3s-software:codesys_web_server

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

Check your stack JSON