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CVE-2018-5440

CRITICAL
9.8
CVSS Score
Published: February 15, 2018 at 10:00 AM UTC
Updated: June 17, 2026 at 02:00 AM UTC
3 products affected across 2 vendorsCodesys Runtime SystemCodesys Web ServerWeb Server

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Severity
CRITICAL9.8
Exploit prediction
EPSS 3%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Codesys Runtime System· 3S Software
95%
v < 1.1.9.19
Affected range stops below 1.1.9.19, so it looks safe — our inference, not a vendor statement
Codesys Web Server· 3S Software
95%
2.3
Web Server· Codesys
60%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

VDB Entryx_refsource_BIDThird Party Advisory
Source: [email protected]
http://www.securityfocus.com/bid/102909
x_refsource_MISCThird Party AdvisoryUS Government Resource
Source: [email protected]
https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

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