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No exploitation reportedFix available

CVE-2019-18858

No exploitation reported by the sources we read.

  • Published2019-11-20
  • Fixed in3.5.15.20
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

Timeline

dates in UTC
  1. 2019-11-2018:15CVE publishedNVD

Versions per branch

NVD
Codesys control for beaglebone
BranchAffectedFixed in
3.5< 3.5.15.203.5.15.20
Codesys control for empc-a\/imx6
BranchAffectedFixed in
3.5< 3.5.15.203.5.15.20
Codesys control for iot2000
BranchAffectedFixed in
3.5< 3.5.15.203.5.15.20

11 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-26-076-01 CISA1 product fixed · 4 known affected

    CODESYS in Festo Automation Suite

    Festo Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0 · Festo Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10 · Festo Automation Suite 2.8.0.137 installed with CODESYS Development System 3.0 · +1 more

  • ICSA-25-273-04 CISA4 known affected

    Festo Controller CECC-S,-LK,-D Family Firmware (Update A)

    Festo Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D (All versions): vers:all/* · Festo Festo Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK (All versions): vers:all/* · Festo Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S (All versions): vers:all/* · +1 more

Full record on NVD

Fix

  1. Update Codesys control for beaglebone to 3.5.15.20
  2. Mitigation from the vendor CISA ICSA-26-076-01 · 4 productsStarting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official…
  3. Mitigation from the vendor CISA ICSA-25-273-04 · 6 productsFesto has identified the following specific workarounds and mitigations users can apply to reduce risk:
  4. Mitigation from the vendor CISA ICSA-25-273-04 · 6 products(CVE-2018-20026, CVE-2019-9010¸ CVE-2010-5250, CVE-2019-9008, CVE-2019-18858, CVE-2019-13548, CVE-2019-13542, CVE-2019-9009, CVE-2019-9012, CVE-2020-7052, CVE-2019-13532, CVE-2018-20025, CVE-2018-10612, CVE-2017-3735) (Product Group: Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Ha…
  5. Mitigation from the vendor CISA ICSA-25-273-04 · 6 productsThe following product versions have been fixed:
  6. Mitigation from the vendor CISA ICSA-25-273-04 · 6 productsFirmware 2.4.2.0 installed on Controller CECC-D are fixed versions for CVE-2019-18858
  7. Mitigation from the vendor CISA ICSA-25-273-04 · 6 productsFirmware 2.4.2.0 installed on Controller CECC-LK are fixed versions for CVE-2019-18858

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-11-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-v33j-h2wh-c582

Frequently asked questions

What is CVE-2019-18858?

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

Is CVE-2019-18858 actively exploited?

Active exploitation of CVE-2019-18858 has not been confirmed. Its EPSS score was 2.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18858?

CVE-2019-18858 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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