THREATPORT/VULNERABILITY/CVE-2018-5440
CRITICAL SEVERITY

CVE-2018-5440

Codesys Runtime System vulnerability

CVSS
9.8
EPSS
3.1%
EPSS pct
86th
Exploited
No known
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 vendor
3s Software
Affected product
Codesys Runtime System
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-121 — Stack-based Buffer Overflow
  • CWE-787 — Out-of-bounds Write
Published
2018-02-15

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2018-5440

  • Confirm whether 3s Software Codesys Runtime System is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2018-5440.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2018-5440

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