Is CVE-2018-5440 in the CISA KEV catalog?

No. CVE-2018-5440 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-5440?

CVE-2018-5440 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-5440?

CVE-2018-5440 has an EPSS score of 3.12% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-5440?

Upgrade codesys runtime system to 1.1.9.19 or later.

CVE & CISA-KEV Catalog

CVE-2018-5440

CRITICALEPSS 86th pctl

9.8

CVSS v3

NVD

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.

CWE-121Stack-based Buffer Overflow CWE-787Out-of-bounds Write

How to fix

Remediation Available

codesys runtime systemNVD

Affected:< 1.1.9.19Fixed in:1.1.9.19CVE-2018-5440derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

3.12%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-121 (Stack-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2009-0927	High	8.8	97%	KEV	Fix
CVE-2020-10924	High	8.8	87%	-	-
CVE-2022-20705	Critical	10.0	80%	-	-

Embed a live status badge for CVE-2018-5440

Markdown

[![CVE-2018-5440](https://tridentstack.com/cve/badge/CVE-2018-5440.svg)](https://tridentstack.com/cve/CVE-2018-5440)

HTML

<a href="https://tridentstack.com/cve/CVE-2018-5440"><img src="https://tridentstack.com/cve/badge/CVE-2018-5440.svg" alt="CVE-2018-5440"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.