CVE-2018-5440

highpriority · track · 40EPSS 0.031 · 88 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.10% (88th) EPSS

CVSS 7.5 · high

Is it mine?

9 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationCODESYS Web Servercisa_csaf_ot
Currently, 3S-Smart Software Solutions GmbH has not identified any workarounds for this vulnerability.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-121USCWE-121USCWE-121US

affected products (9)

Products and version ranges known to be affected.

CODESYS Web Server: Version 2.3all versionscisa_csaf_otUS
CODESYS Web Server: prior to V1.1.9.19all versionscisa_csaf_otUS
3S-Smart Software Solutions GmbH CODESYS Web Serverall versionscisa_csaf_otUS
3S-Smart Software Solutions GmbH CODESYS Web Server< 1.1.9.19cisa_csaf_otUS
n/a 3S-Smart Software Solutions GmbH CODESYS Web Server≤ 3S-Smart Software Solutions GmbH CODESYS Web Serverenisa_euvdEU
CODESYS GmbH CODESYS≤ 1.1.9.19 (как часть системы)fstec_bduRU
CODESYS GmbH CODESYS≤ 2.3 (для автономных серверов)fstec_bduRU
3s-software codesys runtime system< 1.1.9.19nvdUScpe:2.3:a:3s-software:codesys_runtime_system:*:*:*:*:*:*:*:*
3s-software codesys web server= 2.3nvdUScpe:2.3:a:3s-software:codesys_web_server:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-18-032-023S-Smart Software Solutions GmbH CODESYS Web Server2018-02-01icsa · cisa_csaf_otUS
ATTENTION: Remotely exploitable/low skill level to exploit.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd NVD CVE.org MITRE

published 2018-02-15modified 2026-06-17

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+16123 more

references (7)

External citations — patches, advisories, analysis.

https://customers.codesys.com/fileadmin/data/customers/security/2018/Advisory2018-01_LCDS-282.pdfPatchcnnvd
https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02 cnnvd
https://www.securityfocus.com/bid/102909 cnnvd
http://www.securityfocus.com/bid/102909 enisa_euvd
https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02 enisa_euvd
http://www.securityfocus.com/bid/102909Third Party AdvisoryVDB Entrynvd
https://ics-cert.us-cert.gov/advisories/ICSA-18-032-02Third Party AdvisoryUS Government Resourcenvd

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